Ok so I think you first have to check 2 things:
What calipers you have and what size your discs are?
If the discs are as you say 180 & 200 then they won’t work with your m4 (silver 2 piece) callipers.
You have some options though:
Change the discs for the correct ones- 185/165 (No3)or 205/185 with the +20 adapters or change the callipers for No8’s.
Or change the calipers (and possibly the levers) for mono M4 and keep the discs you have.
I can prob help you out with discs and calipers if you want to swap for the cost of postage unless your near the Forest of Dean in which case we can meet up.