Yer that's ok I'm a plumber/gas, the clock cost £140 with the vat, and I charged 80 to supply and fit, so £220 total, you could get a different clock instead if you wanted, the worcester one lets you set times for the hot water preheat, not really worth getting but the customer wanted it, only posted the the problem as dididn'tnow where to start as there was nothing I could do with the boiler, and it was a Sunday, but spoke to worcester technical on the Monday morning, and they told me the fault was with the display/ clock