Best Plasterboard for Bathroom?

[JP_]

Going insulate the external wall with kingspan and put plasterboard up. This will be skimmed and painted (no tiles).
Is green still the best option?
https://www.mkmbs.co.uk/prodb012170...erboard-2400mm-x-1200mm-x-125mm-tapered-edge/

The shower area has the old solid walls that have been plastered. I assume I can tile straight onto this (I might use shower panels - any tips / recommendations for shower panels?).
Shower tray will (hopefully) be 1100 x 900, or 1000 x 900 if I can't get a larger one. Current plan is to just have sliding doors and side pane, although have throught about putting up a stud wall for the other end ...

 

[daggermark]

Away from wet areas I've just used regular plasterboard if its being skimmed and painted. Green isn't going to hurt though.

Regarding plaster, do you mean finish plaster and was it skimmed recently? Plaster is relatively weak compared to the brick wall, so be careful about the weight of the tiles you want to use.