Yeah, you win on gap there RedXS, but at least yours still has a ground electrode! Mine is eroded off at 45 degrees and down to half its thickness! I'll try and get a better pic. The line down the porcelain really is something too. Can't scratch it off with a fingernail. Never seen anything like it (and I've seen a lot when doing antenna design). Wonder if the internal resistor has gone high-impedance. Will compare it with the others and a new one when I get to do the changeover on Monday night.
(Plug replacement is a whole 'nother story in itself. Had to order in replacement NGK platinums today, none anywhere in stock this weekend. Bunged in a "standard" plug in the interim. Could not get the plugs out when I replaced the seals, didn't have the right socket. Finally got that this morning and used an adaptor, a (short) extension, a universal joint, another (long) extension and finally the ratchet. That's worthy of a pic too.)
Thing is, the previous owner said that the cam belt was done at the correct 100,000k service and I took his word for it at the time, but then in a fit of suspicion rang the company that did the service and their records confirm the belt change, but if they've not done something as simple as a plug change, how can I trust what I've been told? I guess the company's got no reason to lie to me, heck, quite the opposite really, they might pick up more work on the car. Just for peace of mind I think I'll put a new belt on the to-do list.
Funny really, it was the solid maintenance record on this car that really swung it for me. Looked at a couple of others, but this seemed the best. S'pose if this is the worst it's going to chuck up then I really shouldn't complain.