I know of a good few anglers that have complained about the spoiling and disruption to their fishing over the past couple of years including in the Parlour Pool.
These have not all been due to non-ticket holders just walking the banks.
When you consider that one bank of the fishery backs on to an Industrial Estate, has a busy Railway Line crossing the Railway Bridge, mechanical machine mowing of the Royalty lawns, mechanical weedcutting and general maintenance by boat and scythe when anglers are fishing, bankside vegetation removal etc etc, the fish still get caught virtually every day during these practices and disturbances. Of course, anglers are not very happy but the fish have learned to grin and bear it.
If you want peace and quite with virtually no disturbance then you should venture upstream on other parts of the Hampshire Avon where it is rare to see a soul angler or walkers and it is truly back to fishing in virtually natural surroundings and river habitat.
You may not catch fish instantly or as easy as on the Royalty, but the river is untapped and unpressured in these upstream areas. Yes, there are some other upstream fisheries where their is a good head of barbel and other species in known swims but most anglers fish near the car parks and generally don't venture much further into the unknown.
Boy have I missed out on a lot by sticking to one place for a very long time.