Hi 'ob' - sadly not, and to add to my woes the inner wall cavity behind was 'foam filled' by a previous owner which removed another option. If my rogue builder is ever found with a 3ft spirit level 'loaded' you'll know who to blame.
When I looked 'deeper' into the telephone cable (and TV aerial) run from the loft I found them both buried deep in a large 'wodge' of plaster behind the board and gave up drilling down through after my 14" masonry bit reached the end stop.
