Had a full service. Got the garage to change my old Cam Follower and Diverter Valve whilst they were at it.
Cam Follower doesnt look too bad, seeing as it has covered 140,000 miles!
The DV has seen better days though, almost totally split. The car feels so different now.
The guy at the garage also commented that the car feels like its been mapped, so ought to get that looked into at some point.