Decided I'd quickly change to a LED festoon bulb in the rear load space and in my haste I forgot to up the metal cover back on, so rather than disconnect it, I tried to slide it over still connected. Buzz, flash, blown fuse methinks, as I've obviously earthed the live side.
Looking at the handbook, it's not 100% clear which fuse it is. Both tailgate lights are off too, and further investigation reveals the heating controls for the front seats are off too.
Check every fuse (in situ) with my trusty multimeter and to my surprise NO fuse seems to have blown, both front and rear fuse boxes.

Does anyone kni which fuse this is? I've double checked all the fuses in the handbook that refer to the heated seats, I think there's 3, but to no avail!

Boy, do I feel dumb for not just disconnecting the bloody thing first!  Got - 2017 SDV8 Autobiography in Loire Blue
Had- 2008 TDV8 Vogue SE in Java black
Had - 2007 S/C in Stornoway Grey

How strange! Went back out today to do more fault finding an lo and behold, all was well!

Lots of faults to clear using the IIDTool afterwards, but it seems I just upset it and caused all sorts of spurious signals to lots of ECUs  Got - 2017 SDV8 Autobiography in Loire Blue
Had- 2008 TDV8 Vogue SE in Java black
Had - 2007 S/C in Stornoway Grey