I love these sort of car forums, someone always knows EXACTLY the info you need down to .2mm!

Well it would have had a new washer on at its last 'official' service so hopefully I can get away with re-using it.

What happened to the days of just using copper washers that fit over the plug?!? I'm certain the washer I picked up are around 2mm thick and are concave so will squish when its done up....