Hello.
Has anybody done Bus/Coach licence while being a qualified lorry driver? Does it make any difference (can you skip some parts of obtaining it) or are you in the DVSA eyes a new driver and has to go through all the steps - theory tests, medicals, and other bs like a well newbie? 
Hello there.
Yes you have to have a medical and pass theory test and hazard perception as well.
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The process is the same as a pure newbie. But it may be possible to shorten the driving course - depending on the standard demonstrated on assessment.
Hope this helps, Pete 
glabrate:
… you have to have a medical
Not necessarily - if you ticked D when you applied for C then that is already covered OR if not then having a D4 medical for LGV within a certain time before applying for D prov will cover it
If got D4 LGV medical due very soon then simply do medical and put D2 form with D ticked in with it and it will get added for free
thanks for all the answers fellas.