http://www.jazzuk.com/donegan.html will get you current details. Denny Wright, Les Bennets, Dickie Bishop all played guitar with Lonnie at times and are featured on his famous recordings.( "I say, I say Les.")
Denny is a fine jazz guitarist and Les had his own skiffle group, Les Hobeaux. Dickie played with all the trad and skiffle groups in the 50s (Barber etc), had his own group, the Sidesmen, and composed "No other Baby" done (too fast IMHO) by the Vipers and resurrected recently in a slow electric version by Paul McCartney, it's also joined my "repertoire"!
I didn;'t get to see him at Guildford but friends who were not previously fans reported back he was the best thing they heard there.
RtS (Lonnie fan- as you may have guessed!)