We've just done ours, I found that it was best to shop around for everything on the net from different places.
We bought an Ideal Standard mixer tap, cheapest was £140 +del
I paid 99p +£6 delivery only because the fixing nut was missing, I made one
Mira shower mixer off Ebay too and the bowed shower cubicle.
I wouldn't recommend buying the recessed spotlights from Wickes, buy 1 get 1 free. They work okay but they bent all over the place when I was pushing them into the ceiling.
We bought this toilet from Wickes, good quality and no separate cistern to connect, the overflow is integrated too.
http://www.wickes.co.uk/Motor-Accessories/One-Piece-Eco-Toilet/invt/200217
The flush is great even though it uses very little water.