These signs might currently cost AU$5,000 a pop (c. £2,350) but the price will fall rapidly as usage takes off.
Mr Mustard can see that these could be deployed on every bay in the Saracens Zone and easily be kept permanently updated with the date of the next event. Motorists would then have no excuse if they missed the date and the number of PCN would plummet (do you see a reason why Barnet Council might not install them? oh you cynic).
Parking management do read the blog and also probably know about this new kind of sign. Let's see what they do.