Thanks guys, I'll try a new display as they aren't very expensive and its easy enough without needing a plumber! Can't see any water damage though, I've checked all the connectors and they seem fine, fingers crossed its only the display that's faulty.
Will report back when it arrives.
As in the title, our boiler seems to be working but there's nothing displayed on the control panel at all. Does anyone know whether the main PCB is likely to be dead or is it just the front panel?? I've probed the cable linking the front panel to the PCB and a couple of the pins are showing...