The tuba part is beautiful to listen too, with a lot of difficult high stuff in the second movement in particular, which ezyena played very well. The third movement, in true concerto form, is mostly fast ad impressive.
The first movement contains a six bars or so quote from the Vaughan Williams tuba concerto, in homage. I love the Vaughan Williams - I played the second movement for CSYS/Grade 8/RNCM audition and it's really beautiful. The other movements are lovely too, very melodic and very English, as Vaughan Williams always is. He's one of my favourite composers.