Thanks for the tip on the gasket in a tube. I thought such a thing must exist.
I eventually managed to get at it using a slightly shorter extender. This is after I bought one of those flexible extenders which can turn corners, but that just twisted up like a rubber band!!
Thanks for all the help, I'll be having a bash at it today as with two old and dirty plugs it's sounding like a tractor at the moment.
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