Oops, dead heat posting there.
As I remember, the Strawbs, who started off as The Strawberry Hill Boys, playing a lot of bluegrass banjo stuff, were named after the teachers training college they attended at Strawberry Hill in Twickenham.
This was a Catholic establishment, and I think that the Principal at that time was Father Cashin, a very interesting man.
Perhaps this Catholic background, might have contributed toward this odd song.

Giok