Thanks to the most useful hint from turast I was able to complete this crossword. Since this would not have been possible without the hint I will not submit.
Ironically I am now completing a polemic - working title "False witness in the 21st century" in which I examine the new range of scams available over the internet.
Could I take this opportunity to thanks all who have offered assistance via this thread over the year?. I will never be in the first division but the Listener offers a stimulating challenge . It stops me getting in the way at home and keeps the brain active.
Could someone elaborate on the 'two threads' idea mentioned below?
Best regards for the festive season