At my cremation it was going to be:
"With my deerstalker hat and my folthediddledee, I was the lover of Lady Chaterlee" But I haven't heard it since yon time so it might be extinct by now.
A few years back, I thought maybe "Sail on" by Dick Gaughan but Mrs BtC said she doesn't like it and as I'll be gone anyway she says...

I think now that a gig by the George Formby Appreciation Society in our house would be nice; but first I'll have to find out if they also know all the words to "Nellie the elephant"