Yeah, Jack, but despite the mediocre sound quality(for the music; the coughs are hifi)I'm happy to be able to hear the world's biggest music festival. If you didn't listen to last saturday's program, it would be worthwhile to punch it up. An orchestra of Juilliard and Royal Academy students with Colin Davis did an okay Vaughn-Williams 6th and a surprisingly good Symphonie Fantastique. Possibly the young players inspired Sir Colin into a more energetic than usual interpretation.
As to timpani concertos, you have me pretty much stumped as to personal knowledge. Although in the thousand or so CDs I have there're of course passages featuring timps(e.g. Beethoven's 9th, Also Sprach Zarathustra, Symphonie Fantastique), there's not a timpani concerto to be heard. Checking a bit, there's this review
of a likely suspect. Listened to some samples here
which didn't have me rushing for my credit card, but there aren't many timp collections available.