Medical question please help

Hi everyone, im a newnposter and need the help straight off the bat from you in the know types on here.

I got my bus licence full manual cat D in 2011 and now i want to oearn to drive lorries. I have been told by a trainer whonis 90% sure that because i had a medical for my Cat D in 2011 i wont need another one to apply for my provisional Cat C.

Im in Leicester and McConnels have said they will give me 16hours training as i am used to driving big buses about and for everything including the stupid CPC training he will do it for £1000. I think that is pretty good unless someone else on here knows where may be cheaper.

But please can someone tell me the answer to my original question about the medical and also IF i need to do mods 2 and 4 for LGV cpc as i already have a cpc card for buses.

Thanks in advance