Thank you for the links, I have been excluding Admuncher from OA, but never tried with Antimalware.
This doesnt make a lot of sense but Ad muncher is filtering fine now !!
I ran the PC back a couple of months via my 3 monthly full image,updated windows restored data etc and updated OA (version on the image was older) Installed Antimalware and updated, installed AdMuncher in this order with OA program guard switched off (mainly due to the windows updates)
and now its working fine without having to add any exclusions in either OA or Antimalware, strange but has been working f