Decided to swap the steering bearings given they've had nearly 35,000 miles on them. They looked pretty good.
Realised that although Delboy's Garage is very good at showing how to do it, the tap, tap, tap 2 min job is actually whack, whack, whack f#€&$!!. Calling in to the local bike shop tomorrow to have the lower bearing taken off the steering shaft as wasn't getting anywhere with the hammer and chisel - really should buy a bearing puller for next time...