As you can see the profile of this lid is different from the one shown above. Where the lock is mounted it goes straight across whereas it should be indented which accounts for the fact that the operating rod is too short to go all the way through. O well, it's too late to return it now ! Strangely though, as I said earlier it latches perfectly well where it is ? Anyway I've taken it to Metal Mickey the local fabricator who is going to extend the rod by 30 mm which should do the trick. Thank you all for taking the time to help me, I shall keep taking my tea at normal strength and, O sorry about the 43 quid Colin but I'm sure you need all the bits!