Patches,
Since my last post, I've found the following on the UK CAA website. Apologies if you have already seen it. Having spoken to my Doc, (not aviation related) he says that beta blockers are indeed used to treat Ventricular Ectopics, but obviously each case is different.
If I read it correctly, you may have to jump through a couple of hoops (ie Excercise ECG) but it seems that certification may be possible if you are assymptomatic, but with an "as or with co-pilot" restriction. I'm not a Doc, but have had a fair few problems with the old ticker. Hope all works out well. Let us know how you get on.
http://www.caa.co.uk/docs/49/EctopyJan08.pdf