greg,
Chas McD in his book Skiffle says:[I paraphrase]
The Imps were a group of 5 12-year-olds (plus one dad on guitar)discovered by Carrol Levis.They appeared on his show; on 6-5 Special and at the National Skiffle Competition. They came from Miles Platting in Lancashire.Their only recording for Parlophone was Dim Dum Blondes(!) and a cover of the Sonny Stewart recording of Let me Lie. They disappeared as swiftly as they arrived. Record Mirror said "Imps leave me Limp" and ended "The only buyers can be the Imps' friends and relatives. The line-up was Danny McGee with his granny's washboard; Don Ainsworth with his father's fishing line attached to an old soap box and his mother's broomhandle; Geoff Wood, Jeff Tranter and Howard Tonge each played a miniature thirty-shilling* plastic guitar
Michael Dewe's The Skiffle Craze only mentions them in passing.

*that's one pound fifty pence, children

RtS
(they would have been about my age so would be 60/62 by now!)