Hi OP. My bathroom renovations start on Monday so I've recently been through all the decision making and it was tough (so many options!)
In the end I sourced all the materials myself and got a joiner onboard who is bringing with him a plumber and an electrician for certain parts of the job.
Our current set up is an ensuite and a main bathroom. One room has a shower/toilet/sink, the other has a bath/toilet/sink. The layout doesn't work for us and the ensuite is tiny (it wasn't put in well by previous owners.
I've decided to knock both bathrooms into one bigger bathroom. There will be a nice 1000*1000mm shower cubicle, a free standing roll top bath, a toilet and vanity/sink and extra cupboard. Oh and a nice big heated towel rail/radiator. The units are a dark green colour and the toilet and sink fit into these. Marbled white metro tiles will be used behind sink, toilet and bath area and go half way up the wall. The rest of the walls will be painted white.
In the shower, I have sourced really good quality pvc shower walls (I went through a lot of samples before deciding on the right design/texture.) I ended up with a marble effect in Matt finish. I was tempted by the wood core shower walls but they were nearly £300 a board and I couldn't quite bring myself to spend that much. The PVC ones were about £80 a board. The shower door is black framed with an easy clean coating. I hoping this means less water build up but I'll still squeegee it after every shower.
For the flooring, I went with a stone effect fully waterproof lvt. It's like a nice coffee colour and I'd textured so non slip and ideal for bathroom usage.
The fixtures/materials are just over £3000 and the fitting comes in at just over £4000 for all the labour (it's quite a big job as a wall needs to come down and the plumbing needs redoing.)
I've saved about £1000 as I'm keeping the old bath, but I'm changing all the taps/waste etc to brass to match the new bits in the bathroom.
My only advice would be to steer clear of Better Bathrooms.