There was an interesting documentary shown some time ago (2004) on BBC following a performance of his opera the 'Turn of the Screw' (story by Henry James I think. it was called Britten's Children and delved deep into his blness. They were searching for bad stuff of course but really didnt find anything substantial although they painted Britten in a fairly bleak light overall. There were some stories about how britten used to 'dump' his favourite soloists as soon as their voices broke but believe me this is a difficult problem for all choirmasters. The more successful the career of a young treble: the harder the crunch when puberty sets in and life does have to go on. One of the people Britten used to work with (Charles Mackerras I think) said how sensitive britten was about comments and whisperings especially when there were casts of children involved in the performances (Noye's Fludde for example). Hardly surprising. One wonders what it would have been like for him now.
There were also extended shots of one of Britten's old favourites returning to Britten's home and talking about his relationship with Britten when he was a teen. Again they were looking for bad stuff but he really didn't dish any up.
It would have been nice if there had been more recognition of the fact that perhaps Britten is not the only bl who never sought 'improper' relations with boys but instead they interviewed parents of boys who had had contact with Britten (and stayed with him in a michael jackson kind of way) and wondered how they could possibly have been so trusting.
I saw this documentary very soon after my own conviction and believe me it gave me some hope at the time and made me feel a little less freaky.
Some of his choral music for boys (particularly ceremony of carols) are now classics of the repertoire and can be agonising listening for any bl(in a nice way.)
I've just googled britten's children and found that this documentary started as a book which I hadn't realised. (It does annoy me when filmmakers do not acknowledge their sources well enough.)
here is a review. its worth reading but dont expect any sympathy here for britten. we can make up our own minds though.
http://www.guardian.co.uk/books/2006/jun/04/biography.features