Thanks for the suggestions so far.
I'm fairly sure the momevment is correct but haven't physically measured it, I've been moving the clutch lever with the clutch cover off and looks good.
I don't mind buying new clutch plates, they are a wearable item after all, but in my mind, as the plates wear you get clutch slip, not clutch drag.
I don't want to chuck £70 ( or whatever they are ) at some new plates if that isn't going to solve the problem.
I'm out on the Enduro bike in the morning but in the afternoon I might have some free time.
I think my next steps are to physically measure the clutch movement with a vernier or dial gauge, I've also found that Beta USA clutch set up article so I'm going to check which way my 'top hats' are facing, then ride as much as can up and down the street and doing figure of eights in the drive and get some proper heat into everything and see what happens.
Then I'm going to have the clutch cover off again while everything is hot and re-measure everything.