Any offers on this? It used to be sunbg by Mike James in Walsall in the 60s/70s. Bits I can remember ...
Blowin' down that old M1
Doin' 'bout a hundred and twenty-one,
I seen a sign said "London Town" --
Guess I'd better slow right down ...
Give ma old hoss a rest!

[...]
Ridin' down your old Pall-Mall,
I seen a cowboy dressed real swell:
Bright blue coat, shiny hat,
Big black boots with shiny spats;
I said "Howdy fella!" as I rode by --
Never even made a reply ...
Musta' been the Bad Guy!

[...]
Well, some's got flu, some's got tet'nus,
Some's got pure racial prejudice.
Take this feller Enoch Powell:
He can't tell the diff'rence 'tween a spade an a trowel ...
Ain't never gonna get the garden dug that way!

No idea who wrote it, or anything else.

Steve