Who fitted the rads and how was the pipework tested?
Not many engineers will be very happy fitting things that you have supplied!
If I were to agree to fit what you bought then my over the phone prices are £840 for fitting boiler and £460 for fitting an unvented cylinder.
Tony
You will see that my budgetary quote is very much in line with information others have given you.
But its normal to commission the boiler when its connected to the heating system.
Part of the installation process is to clean the radiator system! How can that be done when its capped off?
Tony