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Sounds like you have leakage / have caused a slight short circuit. This is not good. It could deteriorate and start to heat and potentially scorch. Best thing would have been to repair the cable at the time.
rodabod-
You're right, would have been nice to fix it, but it would require removing tiles right behind the worktops, so I was hoping to not have to.
I had a guy come round with some testing tools and he decided that it was ok - I guess he was testing for what you describe. Deterioration sounds bad - I think I'll hit Barney up.
It's a bit annoying, there really shouldn't have been a wire there. The previous owner used some massively cowboy builders - we think it was left from the previous kitchen that they replaced it and didn't bother shifting the wiring to a sensible route.
christianSpaceman
Anyone know anything about electricity? I nicked a cable in a wall about a year ago, it wasn't that stressful but just caused the rcd to trip every so often. I was drilling to mount a towel rail, so I just mounted it anyway, ignoring the hole that I'd drilled; Barney (brother of @mashton) reckoned this would be fine.
I've removed the rail, thus exposing the hole again and the rcd has begun tripping again (like a couple of times a day). I'm 99% sure that it must be that hole that's the cause, as nothing else in the house has changed. Anyone know what I can do short of pulling bits of wall / tiles out to fix it? I was wondering if filling the hole with something (for example a bit of wood dowel, or some filler) might work / be safe.