Done a little more research and because it sounds like the centre arm is thuding, it could well be the mechanism is hitting the bulkhead as there is apparently very little clearance in that area, which was apparently finally fixed (following a few iterations/changes over time), by a new lever mechanism in 2024.
Well the newness is wearing off now, looks like a newer design mechanism maybe the way forward,it's a little annoying, more the inconvneience, leadtime to get it booked in during the busy summer season and then the downtime getting it fixed. and I'm sure the cost will be a not inconsiderable wallet lightening exercise. Got to love them, well you can't no matter how you try take it with you..
Update...booked the car into Malvern for further investigation in early August having spoken to Mark Baldwin at some length, who although extremely busy was very accomodating to arrange to inspect the car as early as possible, I also bought the service and MOT forward from October,.as it maybe there for some time. and to save a planned service journey in October.
