Yeah. One pair were about half full. I'd like to know whether its a recent problem - and was found quickly, or whether it was something that happened ages ago. Not that it matters, better just fix it I guess.
On the other problem of the corroded plugs - has anybody got any experience of that sort of problem? I've always assumed that the cylinder head is aluminium and the plugs are steel, which should mean that the actual threads should be OK, and getting them out shouldn't be to much of a problem...Any ideas?