|Just a quick e mail to say that I found this shop was very good in helping me choose the right chair fit (and colour... about 400 to choose from!). They stock the Gregory chair you mentioned, but also lots of others. I found one with very good lumbar support which felt much more comfortable than the Gregory.
Hope this is useful for any other patients looking for a good chair!
I dealt with Steve Larvin who was very helpful and patient!
Kind regards, Karen