anyone tiled onto 600 x 300 porcelain on plasterboard , with a ceramic tile ? porcelain is matt finish and solid . if so what adhesive?

you'd be more than likely pushing it beyond safe load bearing limits mate

Definitely over weight as Doug says, best strip the lot off, tiles will come off, boards will come off with them, better safe that sorry.

Your cracking some weight onto the plasterboard with porcelain and ceramic

do it right for peace of mind, wouldn't want them coming down

typical builder . new bath in . job ready for tomorrow, customer moving back in at weekend, tiles cant come off, usual nonsense

I wouldn't put my name to the job

Rip all off and reboard !! price accordingly(unless it's for yourself)

rip out and do it right

rip out and reboard m8

Sorry matey, but your going to have to listen to the guys above. We wouldnt say these things unless there was a very good reason for it.