Aqualisa / Grohe for your shower.
Not cheap by any imagination, however, they're flappin excellent and should something happen, you'll be able to get parts and get them resolved (remember its Christmas and things tend to break/leak over the festive period ;))
In your situation, i'd look on the interweb (ebay) for a cheapy shower enclosure but pimp it up with some nice tiles, or if your feeling really flash get an underfloor heating mat (£50?) or two, one for the floor, and the other one to gently warm the tiles in the shower enclosure… makes it much more enjoyable/should your skin come into contact with the tiles (and at 900×900 they probably will!)
jt