In reply to Andy Hemsted:
I think your asking quite a lot for tufa in the UK - tends to be in areas which had greater warm and wet than the UK has had. Also requires something to drip off/ onto and so something of a vertical wall or overhang.
Flowstone is easier to find on easy (any uk) routes than tufa, simply by the way they form.
Obviously limestone areas.
Flow stone often feels polished on the first ascent, so a well loved bolted route will gain more shine whilst loosing shine at the same time. Its also quite brittle, so trad on flow stone is less likely to endure. On top of that, it can be quite fingery and so it a harder task master grade wise.
"Good" flowstone routes are a bit of a niche. As often people dont realise they are good as the nature of the rock is harder to climb & appreciate. Bolted dorset has plenty of routes with flowstone on, but fewer which are predominately flowstone through the main parts of the route.
Good luck in your fettish!