A combi is not good for running a bath - takes a long time esp in winter - with no hot water tank you have no immersion heater back-up in the event of the boiler failing - a combi is a little more complex than a conventional boiler and consequently more prone to failure.
British Gas tend to be expensive from what I can gather on here.
There may be an issue with running a new gas supply pipe to any new boiler of any type - the current regulations call for a 22mm pipe but many older boilers had the gas arriving in a 15mm pipe.
It would be sensible to change the tank and the boiler at the same time - call in a couple of independent specialists for alternative quotations - BG tend to "up-sell" and tell scary tales.
Peccavi
August 2010
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