Most DIY disasters are caused bu people not thinking ahead :-)

Assuming new bath goes under edge of existing tiles, as is usual, adding
plasterboard & wall tiles with their adhesive on top will cover up more of
the edge o fthe bath which could look very odd.
I'd knock off the tiles too. I just did this with a bath in place.
Protected
bath, used SDS drill with tile removing bit, took all of 10 minutes.



I think my question was confusing.
Whole bathroom is tiled. Bath is fitted upto tiles. 3 kids under four mean
that bath needed as soon as possible.
I've fitted bath and then was going to tile over old tile for whole of
bathroom.
Wouldn't this make a better joint around the bath with sealant down side
against back tile and then new tile and bath seal on top.
I am not puting plasterboard anywhere near bath. I was asking if i could
save time and expense by plasterboarding/plastering over other 2 walls .
These are well away from bath and tiles well fixed.

Why would it be a disaster. I have spoken to a number of people who have
tiled over tiles succefully. Sounds better than hacking off tiles and then
having to plaster wall to get level before tiling!