Was scanning throuhg the Radio Times and realised that I'd missed this- thank goodness for iPlayer!
http://www.bbc.co.uk/iplayer/episode/b00mzvbc/British_Steel_How_British_Heavy_Metal_Conquered_The_World_Episode_1/

A history of British Heavy Metal, probably nothing thast everyone here doesn't already know but of course includes interviews with our favourite metal gods, and the presenter clearly knows and loves his stuff, its great to see mainstream British radio celebrating the best of British music!