"I saw your site and found it very amusing and
informative. Well done.
"I am a member of Ealing Rotary and we are always
looking for potential speakers at our meetings.
I was wondering whether you would be interested
in visiting us and giving a 20-30 minute
talk on an alternative view of the Underground."
Then there was some information about how often they meet and stuff. Well Ealing's not that far from me on the other branch of the District Line so I may well do it.