Thanks everyone for your suggestions...
I'm pleased to report that after about 9 months, it seems the issue may have been resolved..
We went to an animal dermatologist who recommended Cerenia (meant for human use really, but just to stop the itch for a couple of days); then over about 2...
Sorry to hear of Simon's anxiety problems. We have two four year old Skookham cats who live indoors only. One has developed a severe over grooming problem since January this year. Although the Vets say it might be stress related we really cannot see what stresses him out as nothing has changed...