Thanks for that lineaway. I had never experienced cold stick until I got the Beta a couple of weeks ago. I had a lovely Yamaha Ty250 (which was stolen on me recently but that's another story) and never experienced the cold stick problem with that. So I was totally unprepared when I started up my Beta last weekend, pulled in the clutch (or so I thought) put it into first and it threw me off much to the amusement of my three young sons watching. Not something I'm keen to repeat any time soon.
I bought myself a set of precision files and a Dremel last night. I'm going to clean down the bike tomorrow as per Dan's advice, drain down the oil and get stuck in.