Since Hubert Culot’s 2002 review of this collection, The Fine Arts Brass Ensemble released an album of Arnold’s brass works in 2006, including the first recording of his Quintet No.2, as well as a further recording of his Symphony for Brass. It’s on the Nimbus label and still available from https://www.wyastone.co.uk/arnold-the-complete-brass-chamber-music.html