Not used medcert but check with your FEO first, as I believe some forces are refusing to accept an alternative GP if Outside your registered GP practice. Re being legal, the bottom line is the firearms act gives the Chief Officer the power to do what ever they want to confirm you are a fit and proper person to own firearms.Has anybody on here used Medcert and what did they think of them? Also if not all police forces require it surely it is not a legal requirement
Good luck with your application.