One thing that does slightly worry me is that the council next door, Westminster, is apparently going to introduce Sunday parking charges before Christmas this year, starting at 1:00pm... and when they see all the extra revenue Westminster is raking in, can Camden avoid the temptation to follow suit in 2012? Parking meters are expensive to feed in London now, and it could make things awkward for the dealers, and make the place busier with customers early on, but then quickly falling off after 1:00pm.
Perhaps some special rate in the Royal National Hotel's own car park could be negotiated, if necessary...