I still remember as though it was yesterday going to my youth club and Steve and Muff Winwood who were also members and lived just up the road from me, came in with washboard and tea chest bass and sang some skiffle. I still remember Steve causing uproar by leaving school at the age of 14 to follow his musical career (I think I am correct about that).
A few years later, must have been about 1963, I went to my local trad jazz club at the Roebuck in Erdington, Birmingham. The bloke in front of me in the queue said to the organiser "can I play in the interval mate" The organiser said "OK chief".
This bloke sang Lonnie Donegan numbers through the interval. He was in my opinion pretty crap. Lo and behold if fairly soon after that he formed the Spencer Davis Group. Yep it was spencer Davis.
The rest is history.
Did Lonnie influence them? I think so.

Real Name: Spencer Davis
Birth Date: 17th July 1942
Birth Place: Swansea

Real Name: Steve Winwood
Birth Date: 12th May 1948
Birth Place: Birmingham

Real Name: Mervyn Winwood (Muff)
Birth Date: 15th June 1943
Birth Place: Birmingham

Real Name: Pete York
Birth Date: 15th August 1942
Birth Place: Middlesbrough