Hi Steve and welcome
Some aftermarket clutch springs can give a heavy lever, also clutch noise is common on the Honda CB engines, normally when the clutch is pulled in the noise will disappear, Clutch basket damper rubbers can be repalced with a kit from WoutV which will quieten it down a bit, as will a good carb balance, sometimes the noise is caused by a worn primary chain as its hydralically tensioned and allough it has a spring to assist the tension the oil presssure is not enough on tickover to operate the tensioner fully
I am in Crawley so not far away from you, and a few of us southern R owners in better times meet up at the Spitfire cafe in Biggin Hill for breakfast, so maybe you can join us one day for a meet up
Regards
Keith