Yes, I did have a hand in the casting, Ian Holm being my vision of Barrie from the very beginning. But most of the casting credit should go to the director, Rodney Bennett. We had numerous battles during the production, including the original casting of the young George Llewelyn Davies, but most of his casting I thought was excellent, particularly Ann Bell as Sylvia - yes, that crooked smile caught everyone, not least Nico. Even Tim Piggott-Smith as Arthur turned out excellent, although he didn't really have Arthur's "Italian warrior looks".
My biggest grumble was the adult Michael - he simply didn't have Michael's charm - followed by the ghastly casting of Gaby Deslys, and the rather po-faced actress playing Jack's wife Gerrie (the real-life Gerrie was furious that the unfortunate actress wasn't nearly beautiful enough!).
The real triumph, apart from Ian, was Alexander Buss as the 12 year old Michael. He came down to Ian's house in Kent, and the three of us rehearsed (and slightly rewrote) the Caux/draughts scene over the weekend - just about my favourite in the whole trilogy. What became of him, heaven knows. His father was a friend of Rodney's - a vicar in Wandsworth, who I rather think disapproved of acting - or Barrie - or both - but allowed Alexander to play the part as a favour to Rodney. Whatever, it was an inspired choice.
I also loved Nicholas Borton as the young Jack - another of Rodney's finds - and of course Ian's son Barnaby as the young George, who replaced the original boy cast as George at my insistence!