A provisional sum should be spent at the discretion on the client. I know
irt is too late but what you should have done once you had awarded the
contract or even before if you want is to specify exactly what you want and
ask for a price before agreeing. The Prov Sums are there top assist in the
tender process and really should be specified by you at the outset. You may
not know what bathroom fittings you want at tender stage so you should state
to all tenderers allow £X as a PSum for the plumbing and heating. When you
find your contractor you then have time to specify what you want
As it was a provisional sum all you can now ask is for a breakdown of the
invoice and see if it is fair.