Stiggy

Yes - I'd already bought one of those and did the job today. Good to have a fit and forget set-up, it'd be just my luck to get hit by some wazzock on one of the occasions that I'd forget to turn it on. (I was hit three years ago, at first the driver was reasonable and co-operative but after a few days started lying and trying to deny the damage was her fault, luckily the guy behind me stopped and offered himself as a witness). I did consider Will_Gleaves' recommended solution but to be honest the Add a Fuse was just too simple.

That's great - thanks for the information guys, interesting and kinda reassuring to know of Ford's recommendation. Special thanks to Davyo for taking the trouble to go out and get on his hands and knees for it, really appreciated.

Davyo - I'm doing the same job - can you help with some information? I note what you say about the row of fuses on the left being switched, I assume you're talking about the fuses on the panel under the glove compartment. But for my 2011 Mk3 Focus the handbook lists Fuse 61 "Cigar lighter, rear power outlet" in that row and that's definitely not switched. What Mk is your car?