Thanks to HotelWhisky7 and others who have helped me to grope towards a completion. I have a mate called Bishop who lives in Blackburne. Although he often plays the fool, he's also a scholar, so I thought he might help in some way, but he's on a work trip to Dubai at the moment, so I can't get hold of him.
P.S.
Norah, are you the Jackie Weaver of the Listener Crossword help forum world?
PPS
Ploughty, get over yourself. The "accessibility issue" that prevents you from typing out the clues does not seem to have affected your ability to post all the other stuff you've put on here recently.