UPDATE 
Nine Worlds/Geekfest were very quick 
to reply and address my points, which I'm genuinely very impressed by, 
and where they had missed out on an update (the FAQ page), they quickly 
adopted my suggested wording for making it clear that the suggestion 
wheelchair users should consider the Marriott was room availability,  
not a general recommendation. (I think there was an under-estimation of 
how seriously wheelies might take being 'advised' to use another hotel, 
most walkies don't understand just how unaccessible the built 
environment still is to those of us who come with wheels attached). The 
agreement to reimburse wheelchair users for taxi fares between the con 
hotels is a good compromise to the accessibility problem.
So
 am I completely happy and am I going now? Not entirely and probably 
not. Geekfest have fixed the access problem, but the problem still 
existed until a month before the con without being addressed, that's 
something that needs to be addressed for Geekfest 2016. The issue splits
 into two linked points, with the first of these being the attention 
given to access in the initial con hotel choice. It looks awfully like 
that got overlooked this time around, with the result that attendees 
were booking into hotels it was physically impossible for some of them 
to get between. That's a pretty fundamental problem. Either you pick 
hotels wheelchair-using fans can get between, or you make sure there is 
some accomodation in place and publicised in time for people to make 
informed hotel choices (and that second option is very much the worse of
 the two). The second point follows on from that, access information 
needs to be in place from the moment booking opens, if not before, 
because wheelchair-using, and other disabled fans, have to make serious 
decisions about whether their needs are being addresssed and whether 
getting between places will still leave them able to enjoy the con. 
Access isn't something you can leave until the last minute.
That
 last point is why I'm probably not going. I'm neurodiverse as well as a
 wheelchair user, and for various reasons taxis stress me badly. The 
solution will work for most people, but for me it just creates more 
problems. When I found myself thinking "well maybe I could use my 
wheelchair as a walker between hotels, that'll get me past the lack of 
kerb cuts and avoid needing to use taxis" I realised that I needed to 
say no, because either I was going to wear myself out physically or 
mentally. (And to be fair to Geekfest I've also thought of another way 
to use the money, it's likely a combination of both reasons, rather than
 solely one on its own).
I hope Geekfest 2015 goes well. I trust Geekfest 2016 will do it better still.
*****
When a friend noted she was planning to go to 9 Worlds/Geekfest, due to 
be held 7-9th August at Heathrow, I was initially excited, I'd missed 
going to Eastercon for health reasons and this looked like a good 
substitute. Heathrow is a bit too far to commute from Kent, so I went to
 check the con hotels for accessibility, and that was when I was left 
with a nasty taste in my mouth.
How to Book A Hotel Room
The
 convention hotel for 2015 is the Radisson Blu Edwardian Heathrow, on 
Bath Road just north of London Heathrow Airport. Rooms at the Radisson 
are now sold out. We've agreed convention rates at two nearby hotels:
- Renaissance Heathrow - £89      / night for one person or £99 for two.
 The Renaissance is on the other      side of Bath Road. It's close to 
the Radisson, but you have to cross over      pedestrian crossing points
 as Bath Road is a large dual carriageway. The      crossing points are unsuitable for motorised wheelchairs as they are not      properly lowered.
 It's about a five minute walk at 'standard' walking      speed. Google 
Maps walking directions are incorrect for this route as you      can 
just go straight between the two sites.
- Park Inn Heathrow - £86      / night for two people, or £77      for one person. The Park Inn is also on Bath Road, on the same side of      the road as the Radisson, but there are a couple of junctions, a few      unrelated buildings, a petrol station and a McDonald's between the two hotels.      It's about an eight minute walk at 'standard' walking speed.
Both
 hotel rates include free breakfast and in-hotel wifi. Bookings are made
 with the hotel rather than Nine Worlds, and they can take bookings over
 the internet or by phone. 
For wheelchair users, we would advise 
considering the Marriott hotel. The Marriott is slightly closer than 
both of these - it's further down Bath Road on the same side as the 
Radisson, has good access facilities, but we were unable to agree an 
affordable room rate with them. It's about three minutes walk at 'standard' walking speed, with one junction to cross.
(my
 italics, note that the pricing information given for the 'official' con
 hotels isn't repeated for the one wheelchair users are being advised to
 use - too embarrassed? Note also that there is no indication as to 
whether the junctions between the Park Inn and the Radisson have 
kerb-cuts - and the petrol station and McDonalds are also likely to be a 
problem for that. And if the route from the Renaissance isn't suitable 
for motorised wheelchairs due to lack of kerb-cuts it probably isn't 
suitable for most manuals either, not all of us can wheelie up a 6" 
kerb.
I need to know distances, not 'x minutes at normal walking speed' - here's a clue, people who need to know don't walk at 'normal' speed, and I need to know if every junction and entrance (McDonalds, petrol station) on the route between hotels has a kerb-cut, because falling arse over tit out the back of my chair into a busy road trying to wheelie up a too high kerb does not appeal).
  
Whoa there! This policy is from Nine Worlds 2014. We're at the  same hotel for 2015's Nine Worlds, but we're still reviewing all of the  content on this page.
 (my italics, it's a month to the con, and you still have accessibility covered by a placeholder? Seriously!?!)
 
In summary
We’re
 running at the Radisson Edwardian, Heathrow. We have step-free access, 
accessible toilets, gender neutral toilets, designated quiet space, car 
parking, kid-friendly content, a minority of clearly marked 18+-only 
content, and space for feeding and changing. We’re running as 75-minute 
sessions with 30-minute breaks, and attendees can enter and leave 
sessions as they like.
 The Radisson has a limited number of wheelchair friendly / accessible hotel rooms. We recommend the Marriott next door as an accessible alternative if the Radisson books out.
(my italics, they recommend the Marriott, but don't mention it isn't a con-hotel)
 
Hotels
Nine
 Worlds 2015 will be held at the Radisson Blu Edwardian, Heathrow. The 
following is a brief overview of some of the hotel's features from an 
accessibility point of view; if you have any specific access queries 
please contact 
access@nineworlds.co.uk, tweet 
@9Waccess or 
contact the Radisson hotel directly.
....
The
 main circulating and social space for Nine Worlds is in the  atrium at 
the top of the building. Access from the lobby is by climbing  38 steps 
(with four landings) or by lift; the lifts are not directly in  the 
lobby/atrium but are clearly signposted along a side corridor. Lifts  
are big enough for a standard wheelchair plus companion, although
 users  of larger wheelchairs or scooters may have difficulty. The lifts  contain mirrors to aid reversing out. 
The
 atrium is naturally lit from a glass ceiling and consists of  smaller 
self-contained areas. These are connected by walkways and  shallow ramps
 (including temporary ramps which will be in place for the  duration of 
Nine Worlds where necessary).
One area is earmarked for 
possible use as a children's area;  access here is down two steps which 
may not be possible to ramp. More  information on this will be available
 in due course.
The main entertainment and vendors 
areas are in a large room off  the atrium. This room is a couple of 
inches below the level of the  corridor, with a carpeted ramp in the 
doorway. The entertainments and  vendors room, along with most side 
rooms, are carpeted. Access to this  room is through double doors which 
are held open when the room is in  use.
Direct access 
to the main convention bar is down two steps from  the atrium; step-free
 access is via a ramp at the opposite end of the  atrium.
....
  
 (my
 italics, people with powerchairs or scooters may have trouble accessing the main 
con area? WTF? Why are they in this hotel with so basic an access 
fail?And as for scored-through access information, does that mean it's 
no longer relevant, no longer accessible or what? Access to the bar is 
pretty damned fundamental as far as I'm concerned!)
  
Hotel layout - Marriott
.... 
 (Note, no mention that the Marriott isn't a convention hotel, in fact 
no explanation why it's mentioned at all - if you can't even list the 
relevant hotels?)
Hotel layout - Sheraton Skyline
....
(Note, no mention that the Sheraton isn't a convention hotel, in fact 
no explanation why it's mentioned at all - if you can't even list the 
relevant hotels?)
Restaurant layout - McDonald's
As a lot of Nine Worlds attendees use the McDonald's on Mondial Way  outside the Radisson, we had a brief look here too.
 The step-free route  from the pavement has narrow chicane barriers 
across the footway which  would block access for users of most mobility 
aids including  wheelchairs; the only way of avoiding these is via the 
roadway. The  building has automatic doors opened by push 
buttons, although these were  not working when we visited. Assistance 
dogs are welcome.
  
(my italics, this seems to confirm there are access issues between both secondary hotels and the main con hotel)
  
No
 access information is given for the two actual secondary con hotels, 
the Renaissance and the Park Inn. The price difference between the 
official con hotels and the one wheelies are being advised to use is 
marked: Radisson Con-rate: ? (not stated in faq, presumably as sold 
out), Renaissance 
Con-rate: £89, Park Inn 
Con-rate:£77, but Marriott 
£127. So that's between 
£38/a night and 
£50 pound a night extra, a 
minimum of 
£114 extra for a wheelchair user who wants to stay three 
nights to ensure they see the whole con.
  
It looks awfully like 
Geekfest have stuck with a semi-accessible hotel rather than look for a 
better one as that's convenient for them, then negotiated con-rates with
 different secondary hotels to last year without giving any thought to 
accessibility, then stuck up an 
oh, wheelies had better stay at the Marriott
 excuse when they realised it's an issue, and just hoped they could keep
 quiet about the cost issues this imposes on wheelchair using con-goers.
  
Not impressed, don't know half the information I need, have no confidence in the rest, refuse to be exploited for being a wheelchair user, probably not going :(