The LGV medical takes only a few minutes, take some Sellotape to seal up the back of the envelope if sending it off to the DVLA, and a black Biro pen, to fill in parts of the medical if needed to do so, after seeing the Doctor .
I always write my address on the back of the envelope, in case it goes missing in the Post Office system .
Before posting it, make sure all the required questions have been filled in, do this before leaving, after seeing the Doctor, he or she will not object to checking it again for you .