Consumer Guarantees Act 1993, ss 28–31
The Act guarantees that the service will be:
carried out with reasonable skill and care
fit for the purpose that you told the supplier the service needed to be fit for
completed within a reasonable time (when there’s no agreement about time)
carried out at a reasonable price (when there’s no agreement about price). If you haven’t agreed on a price, the services must be carried out at a reasonable price. If you’re charged more than a reasonable price:
and you haven’t yet paid anything: you can refuse to pay a price that is unreasonable (however, you don’t have a right to cancel the purchase – you must pay a reasonable price)
and you’ve already paid: it’s too late to dispute the price, and you don’t have a right to a refund.