This is not a recommendation because I have not met this OT (Fiona Prior) who practices in London N13 but she has been in contact with the MEA to say that she works with people who have long term conditions, including ME/CFS
This is her website:
http://www.adaptiveot.com/people-with-long-term-conditions
And if you decide to take this further feedback would be appreciated
If you are able to travel, I can recommend Sue Pemberton in York, with whom I have worked on a number of ME/CFS related issues over the years, most recently disability assessment in relation to reform of the ESA WCA