You should be crediting the writers whose modern copyright work is being reproduced here.   One of the co-writers was actor Mike Pratt - (he was Jeff Randall in Randall and Hopkirk. Apart from acting he was a musician, playwright and songwriter. The song was written by Lionel Bart, Mike Pratt, and Tommy Steele (under a pseudonym). Steele gave royalties from the record to a kids' cancer charity. The song was nominated for an Ivor Novello award.