So I've been at this a few weeks now.
I didn't run the bike for about 10-15 days over xmas, and when I came to start it it wasn't having it, it would turn over but not start.
So i charged the battery and it started (reluctantly)
Took it to work and 8 hours later again it would't start so I tried charging the battery but no luck (had to leave bike at work over the weekend)

I charged the battery again for a little longer and it seemed to work, it got me home, and seemed to work for a few days.
Then I left it 2 days that weekend and after that it wouldn't start.

I tried charging again and sometimes it would work, other times it wouldn't.

I looked at the spark plug and it seemed to be ok, but I bought a new one fitted it and charged the battery for a good 24 hours and it started quick (like really quick)
Took it for a spin for half an hour and left it at that.

So I thought I'd figured it out!
Left it for 24 hours and then back to same, turning over but not catching (as always)


As far as i can tell my multimeter says the battery is charging and then holding the charge about 12-13v if it wasn't i would definitely presume it's the battery!

I'll be buying a new battery tomorrow anyway as I've run out of ideas...

Anyone any more ideas?

Thanks for listening