Naxos has an excellent series of Britten recordings. If you get their 2005 catalog, usually free, you can see all that's available. New/recent recordings include Volumes One and Two of his Orchestral Song Cycles; another CD of St. Nicholas, Christ's Nativity, and Psalm 150; and a fourth CD of Seven Sonnets of Michelangelo, Holy Sonnets of John Donne, Winter Words, et al. There's also some very recommendable Britten orchestral, instrumental, and chamber music on Naxos--all very inexpensive. Worth checking out.