Thanks for all the advice lately. The bathroom is now finished and I know you like people to come back and show pics so here are a few before, during and afters 
This forum is by far the best trade/DIY one I've come across, always quick and helpful replies, so thanks again and I'd always recommend it people whether they're looking for a tiler or want to give it a go themselves.
Before:
Ripping out horrors:
After: Thanks for the setting out advice, I managed to get whole tiles off the bath and whole tiles under the cill as you suggested
This forum is by far the best trade/DIY one I've come across, always quick and helpful replies, so thanks again and I'd always recommend it people whether they're looking for a tiler or want to give it a go themselves.
Before:
Ripping out horrors:
After: Thanks for the setting out advice, I managed to get whole tiles off the bath and whole tiles under the cill as you suggested
