It depends whether he's at home in the week or just weekends. My church (Holy Trinity Clapham, on the common near the paddling pool) have a dads group two Saturday mornings a term, Dynamite Dads. The next one is 7th March and it includes a cooked breakfast! holytrinityclapham.org/parents/ If he's around in the week there's
www.dadsandlittluns.co.uk in wimbledon on a Monday and Friday morning. A friend of mine went to this regularly when his were small and really enjoyed it. (I think they probably indulge in the odd bacon sarnie too, sensing a theme?!).