Having said all that I just noticed (with the nights drawing in) that the reverse light no longer works!

Bugger.

Old normal bulb also doesn't work and all the wires look fine.
No dash warning lights and Park Pilot comes on when put in reverse.

Need to check the fuse but buggered if I know which one relates to the reverse light.

Just to note that this ended up being just a faulty bulb, the old normal bulb did work but I'm a ditz that didn't realise that the power is cut to the reverse light when the boot is open. I returned to ABD supplies who tested and replaced for no charge (bought in May). They think the chips must have failed rather than the CAN bus circuit, hence no dash warning.

It is now winter so I can confirm that 1 month on, the light still works.