You were right Wilky - certainly more interesting than Carnival.
First movement certainly needs a good strong tongue technique at the lower end. I also like the p passage in the first movement. The whole movement needs dynamics to be controlled and contrasted or could turn into one blast from beginning to end.
2nd Movement - time for the tongue to get a rest and a quick kip before Mr Barry has written some nice pedal sustained for us. Then at D I love it! We actually get a tune on Bb. Too often we have to sit and listen to the Ebs with the euph get the glory we too get a share!
3rd movement again nicely written and a sensible range for Bb basses.
Overall I am loving the piece. We are going to run a movement or 2 in a concert tomorrow night. Be interesting to hear what Joe Public thinks.