Some really helpful stuff here.
To update you all: I took the bike for a test ride yesterday, and it's literally never felt so good! The clutch is not exactly 'effortless' but it's a damn site less effort and even more amazingly I can very easily engage neutral. Something that was never the case before.
All in all I think the bike is about the best it's been since I've had it. All thanks to the advice I've had on here. So cheers all!
I've still got food for thought though and have bottled the 240mile round trip I was planning to do from today (I'm taking my 'other toy' instead: Triumph GT6!). Sods law that will break down now!
Once I've taken it for a proper long distance ride I'll let you know if I feel the need to open it all back up again / start fiddling around with the clutch lever down by my right foot. The idea I like best is Dutch's though since it's weird that the adjuster seems to be in the right place, but the lever seems to be in slightly the wrong place!
Cheers