One slight problem: I would have to find a co-driver, as the rules require two qualified and insured drivers per car for safety reasons. It doesn't take place until next June so I've got plenty of time to think about it. I'm sure I'll be posting on the subject again if I do decide I want to do it.
Note that the full trip is actually twice as far as the JOGLE itself because you have to drive up to John O'Groats first and then back from Land's End afterwards.
Edit: and I've already had my first volunteer co-driver: RogerRust from the Morris Minor Owner's Club forum. Don't let that stop you volunteering though; maybe I can run some kind of contest to choose the best candidate ;). Roger has the benefit of experience in that he's already done a previous JOGLE in 22 hours.
Some quick back of the envelope calculations suggest I'm likely to use about £160 worth of petrol over the whole run (at today's prices) if Fenchurch is as economical as I think she will be.