Right then....
I had a PCV installed and tuned on Wednesday, along with O2 eliminators. I can report a vast improvement. Previously my bike was an absolute pig when cold, stalling, bogging and generally running like a bag of shit until fully warmed up. Since fitting the PCV I've commuted it into work deliberately driving when cold and its run perfectly. Not a hint of bogging and stalling. This isn't a fluke, mine was such a bitch I'd have had several stalls in any 48hr period. So.......I think it's fixed.....fingers crossed.
Install and set up was done by these guys http://www.tekmotive.co.uk/
Can't recommend them highly enough.