Steve,The other Leslie wasn't Leslie Henson (?father of Nicky, husband of Gladys, uncle of Basil- I may have got the relationships mixed up but all the same thespian clan) was it?
My grandfather used to do the "A for th'oss" alphabet as well!
Robb Wilton (LOVE his work) used to do a lot of those "I said who" monologues with piano background.
RtS (dim-bulb still flickers in to life at times)