Am reviving this thread because I have just returned from Ewan's second two weeker at GOSH so have updates on restaurants etc.
The Italian restaurant that Julianne mentions is still good and not too expensive,(although i never fail to be shocked by London prices however much I try to prepare myself!) A group of us went there and one was in a wheelchair, they didn't have a table for ten upstairs so they carried her downstairs! They couldn't have been more helpful.
Also when your kids are in the physio sessions and you want to escape the hospital environment, again as you turn left coming out of the hospital main entrance, there is a lovely little cafe called Tutti's they do a largish cuppa for 1.15 and hot chocolates, coffees etc much cheaper than the Starbucks opposite it, and have squashy sofas to sit on as well as chairs outside for the summer. They were very friendly and started to remember our 'usuals ' within a week!
If you turn left coming out of the patient hotel and walk straight up towards Southampton Row there is a restaurant called Cagney's it is really cheap and basic with fish and chips , roast chicken, omelettes etc as well as other more complicated fare. It also does takeaways , you can order over the phone but someone has to pick it up they don't deliver.
If you turn left but walk towards the tube station at Russell Square there is a row of shops and another good italian, and on Southampton row itself there are lots to choose from, independent restaurants as well as chains like Pizza Express etc I found that it was worth searching the voucher websites before going for two for one offers etc for the chain restaurants. I had one voucher for Cafe Rouge which there are lots of dotted around the major attractions(like near theatres etc) and had main course and drink for 10 pounds, and it is really nice food normally costing much more. It is worth looking also on the two for one by train site if you travel up by National rail. They have vouchers for two meals for the price of one, as well as tickets to theatre shows and major attractions, all buy one get one free.
Supermarket etc wise, right by Tutti's etc (as you turn left coming out of the entrance of GOSH) there is an independent eco supermarket called the 'People's supermarket', it has all the essentials and is easily the nearest to the hotel and hospital, I liked it too because it catered for coeliacs like me and my son.
Hope this is of help for people going on the 2 weeker.
Aged 47, dx EDS 3,POTS, Coeliac, breast cancer 2002. I have 4 children: son 14 - HEDS & Coeliac, daughter 25 - HEDS, POTS, pernicious anaemia, daughter 27 - HEDS, Behcets syndrome, also daughter 22 & 3 grandchildren unaffected as yet.