I would very much like to have heard this, as part of my continuiong exploration of Britten's music. Unfortunately I was travelling down to London that evening, so I'll try & watch it online. Try, because my attempts at listening & watching stuff on my computer is usually frustrated by constant breaks while it downloads.
When you've managed it perhaps you'll be able to advise other people?
Just to say that the CBSO/Nelsons DVD of this magnificent 50th anniversary performance, live from Coventry Cathedral, is now available. About £15 post free at Amazon.