name='Rowdon']The single came out on BBC Records in 1973, and is credited to Highly Likely
. It was written by Mike hugg of Manfred Mann (and the "Ski - the full of fitness food" yoghurt advert, more importantly) and Ian La Frenais, so I imagine Highly Likely is them - though the rumour at the time was that it was Rodney Bewes, as the song has the same bewildered melancholy bonhomie that his acting has, I suppose. Apparently not true, though.
I got mine off ebay, and played it to death on my radio show in Barcelona ... always brings a tear to the eye.