Hi Matthew and Welcome to the forum, you might want to have a look at the following FAQ which explains where everything is
Welcome to Benefits and Work It is unusual for DWP or the assessors to contact the claimants medics. For this reason, we suggest submitting whatever supporting evidence you can rather than taking a chance. The more the doctor's letter relates to the specific descriptors for the benefit in question, the better.
If you are not clear about these descriptors, they can be found in our members' guides
PIP help for claimants ESA claims and appeals May I suggest that you bookmark/favourite this on your web browser now so that you can find it easily in future? This will allow you to return with further questions or comments about your claim without having to start a new topic each time. It helps us enormously when everything relating to the same claim is kept in one place - and I hope you will find it helpful too