Rick Fielding,
Ramblin' Sid Rumpo' was a radio character. I think it was in a programme called 'Round the Horne' but not sure.
A friend lent me a tape once, and he was instantly recognisable as Kemnneth.

From the one episode I heard, Ramblin Sid was a spoof folk-music artist & collector.

The format seemed to be that he gave a short account of his recent travels, discussed the source of a song, then sang it. The one I heard had lines like: "I've been a ramble-o, a wander-o,around the country-o, a drivin' of by Bently Continental-o" He then explained that he'd learned this song from the herring fishermen of the village of (ridiculous made-up name) who fish from traditional wooden rowing boats. They are a sad & contemplative people, 'cos the village is 50 miles inland. He then sang a slow air with much innuendo, and many nonsensical made-up words which ALMOST sound like a dialect. The only words I remember are "I've broken my cord-wangle."
Naemanson, Kennith Williams was an English comic. He was usally camp in the extreme. He featured in most of the best "Carry on" movies ........'Ooooooh Matron'.......as well as other movies.He also did stage and radio.

His delivery of the line 'Frying Tonight' in "Carry on Screaming" still makes me almost ill with laughter, and is widely regarded as a classic comedy moment. Many would regard him as a comic genius, but as Rick said his private life was far from happy.