Bathroom refit price

Hello, I'm looking at possibly getting our bathroom redone. I've had loads of problems with poorly fitted tiles coming away from above the bath and considering getting one of these https://www.victorianplumbing.co.uk/aqualusso-alto-04-1200mm-x-800mm-offset-shower-cabin-polar-white or similar. Just need rough figure. I don't currently hae time to get people in to quote so just trying to get an idea of costs. Currently we have a P shaped bath with shower. The job would consist of: Removing the bath Removing wall tiles Re-plastering the walls Fitting the shower cabin Removing floor tiles Fitting new floor tiles. I appreciate there may be additional work to do other the above but just looking for an idea. The bathroom isn't very big, 11'6" x 4'4" We were quoted £400 to fix our original tile problem (which we have had attempts before) so just trying to weigh up the options before getting a few quotes. Thanks.