Prime Minister admits that he is struggling to cope with the revelation . Samantha ##bull says David is ' the best celebrity she 'd ever seen ' Follows survey of favourite Davids to mark St David 's Day this week . Walliams has been a frequent visitor to channel 10 in recent years .
Prime Minister says that he is struggling to live with the revelation . Samantha Cameron says David Walliams 'the funniest man she 'd ever met ' Follows survey of favourite Davids to mark St David 's Day this week . Walliams has been a frequent visitor to Number 10 in recent years .