Still chewing over with hubby what way to do CH and DWS.

Learnt a lot from all of you boys in the last few weeks - thanks. Reading
with interest the "Thermostatic or electric shower from combi" thread posted
by Eno. Makes a lot more sense when you understand the terms without a
dictionary of gas and plumbing terms!

The latest brainstorm from us is thus:
Replace oil boiler and all tanks with condensing gas combi.
Leave crappy water supply of 15mm as is - (11 litres per minute) and plumb
it to all kitchen equipment - sink, dishwasher etc.
Bring in new 35mm water supply and plumb all "upstairs" stuff with new water
supply through combi (and kitchen hot tap). Will feed 2 loos, 2 showers and
1 bath.
This is after friendly plumber's advice that just upgrading the supply as is
mightn't be enough for our needs as a family of five.
Combi will do CH and one large underfloor heating area and bathroom stuff.

Big story, one small question:
To avoid digging up lovely new tarmac drive, we would like to bring it
through grass to near the front door and then dig across paved step area
which would be relatively simple to re-lay, in under door area and straight
up the hall (needs levelled anyway to tile, its like a dog's hind leg at
mo). But can we? Is it silly to bring 35mm water supply through a hallway
in case of leaks etc? Is it stupid to put a gradual bend in the pipe just
to save a drive?

Like John's idea of the Mira 415 shower valve. Avoids Bart-Homer-esque
moments in the shower, and singed kiddies. Any drawbacks?

Ok that's 4 questions, I'll stop now.

Many thanks
Suzanne ¦^D