That seems expensive
We used Brad at the Hamilton Group to do our 3 bathrooms and they were fab. Happy to send photos of the work they did for us, 3 years later we've never had a single problem. They can do some really unusually designs too, Which I think they have on the website but I'm sure they could show you.
We sourced the fittings ourselves and I guess that's where the costs will be bumped up depending on where you buy and if you want tile or marble.
I'd say if you get your fittings from bath store and use tiles then you're probably looking at about £10k per bathroom. If you go for marble and high end fittings then it can be £40k per bathroom upwards.
If you call Brad at the Hamilton Group he'll talk you through options, he's a lovely local dad and won't put pressure on you.
020 7738 8967 http://hamiltongroup.co.uk/