I'm not sure whether mums are allowed to post here, but DH doesn't have a MN account, so consider this a post on his behalf! 
DH would like to find a dads' playgroup/fathers' club. Having done a little googling, we have found this one in Wimbledon: www.dadsandlittluns.co.uk/index.php - but we can't find anything in North London (where we are based). Does anyone know of one?