Although I live in Doncaster, I passed the course in London through the London FA. The instructor (Patrick Jones) was brilliant IMHO and the London FA very helpful. After qualifying, I transferred my parent county to Sheffield and Hallam to complete my 6 games and I've received very little/next to nothing in way of mentoring or assessments. That still remains the case today. Next year I will be going for promotion to L6 and I dread to think what the process will turnout like.
For feedback, I ask other referees but it's usually when I'm assisting them. My only other measurement is when I get awarded league cup semi-finals, finals and play off matches. I assume these are a meritocracy and given for excellent marks and therefore, I believe I'm doing okay. I'm hoping the local RA will be a source of help and guidance this season.
After a game, the less comment I hear about me the better, but feedback would be nice from someone I can trust in and knows what they're talking about.