Has it been snatchy since the replacement motor was fitted?
No, it was like that already. The new motor had only done 17.5k (it'd only done about 1,500 miles a year!) and hadn't been ragged.
I've just ordered the MT07 (FZ07) clutch arm 1WS-16340-00 from Fowlers Parts although they've got to get in it from their Europe shop. I6 was £26 including shipping which was the cheapest I could find it, elsewhere it was £31.
When I get it, I'm going to install it and the new clutch cable which should sort things out