In his autobiography, which he co-wrote with Mick Wall, music promoter Don Arden (1926-2007) gives the impression he didn't think much of this song; he even got the title wrong.
Although Christmas songs are two a penny, by no means all of them are, and this Roy Wood composition has a real feel good factor about it, and uses a school choir from Wood's native Birmingham. The original was recorded in August 1973 at Phonogram Studios in London. It was backed by "Rob Roy's Nightmare (A Bit More H.A.)".
It failed to reach #1, but it is as Arden said, a perennial favourite, although his language was a little more colourful.
Alexander Baron - London, England