Cool,
Not sure about the high Eb in Tarus Bulba, are you mixing it up with Janacek's "Glagolitic Mass'' ?
I'm sure I heard that performed last year at the Proms by the BBC Scottish Symphony (Mahler 7 in the second half). Their Principal Trumpet (and my former teacher) Mark O'Keeffe was on wicked form (as usual) that night. I seem to remember he used Picc for parts of the Janacek which may be what you are referring to.
Symphony Orchestra + Choir + Organ in the Albert Hall, SPINE CHILLING STUFF!!
Supplimentary Question! Janacek Sinfonietta? that has to be a trumpeters favourite. I played it a few years ago, again with National Youth Orchestra of Ireland. Apparently, recently here in the UK, a chap hired the Royal Festival Hall, London Philharmonic lock stock and barrell to get them to play the Sinfoneitta for his missus as it is her favourite piece!! I'm sure it made the news here, but I can't find any references..