Off an ebay site. Just typed in 'p 458' in ebay and trawled for a minute. I think it was called parts clearance centre based in bristol (no phone number). Part arrived the next day excellent service.
hi. have been in house 3 years, boiler in from new about 7 years. No problems till now. Heating on timer button will not work. I can still get hot water when switch to constant. Thermostat has also stopped working no lights and no 'click'.
Have replaced thermostat and pcb p769 but still no joy...