You blew your own thread out of proportion with your stupid comment. I'm not the only one who considers you ill advised.
+1
But, OP, you appear to be very cynical, but seriously weird.
First, you say your plumber is very good. But not good enough, apparently, to be allowed a profit. Secondly, I cant believe a plumber will quote over £ 200 for materials, but not be able to at least show a picture of the goods.Are they cross heads, levers or knobs. Will they in any way complement your other taps, or decor?
Thirdly, you must be an idiot to agree to pay over £200 (plus fitting presumably) for products about which you know nothing (and expect us to somehow know whether they are good value.
Good luck, you may need it. Having siad that, you obviously won't read this
He'll need to ignore it twice!!.....