Action for ME has produced a factsheet to help GPs understand why their medical evidence is so important in supporting benefits claims and appeals. If your practice is reluctant to provide such information or makes a substantial charge for it, consider giving a copy to your GP and practice manager.  If a GP is too busy to read the factsheet you may wish to tell her/him briefly the key points and check that your medical record is up to date.

Supporting medical evidence for people with M.E./CFS: a  guide for healthcare professionals who are asked to provide reports for welfare benefit claims and appeals  AfME, August 2013