by Morwenna Brett Opportunities to hear the organ uninterrupted on UK network radio are few, although BBC iPlayer allows us to catch up via the internet with what there is -  as I write I'm streaming last Saturday's Radio 3 broadcast of a Bach recital by David Goode, on the Metzler of Trinity College, Cambridge, via iPlayer.  The BBC's weekly broadcast of Choral Evensong is on iPlayer of course, for a limited period afterwards, and usually includes the opportunity to hear all of the final organ voluntary, instead of fading out after eight bars as they cut back to the…