The dates chosen do give the impression that the cut-off dates were arbitrarily designed by someone in Westminster, because "London has it, can't be that hard, surely". Isn't 1972 the date when vehicles no longer need to be taxed, so was "convenient"?
I hope I'm not misremembering too wildly when I say I was told at my local depot, the people fitting them were getting through three buses a night. The allocation is 86, so that's 29 days just to do one depot... Naturally they aren't the only fitters in the land, but it's no wonder smaller companies that may only have a handful of vehicles, which may be of different types, needing to connect to different sorts of destination display are struggling to find companies willing to talk to them, at least yet. One operator may have a Solo, an E200, an Evora and a coach used on schools, with Hanover destination kit and Ticketer ticket machines. Another, a few miles down the road, may have three coaches, a Streetlite and a Dart, with Mobitec destinations and Transmach ticket machines. Not exactly the sort of thing that lends itself to 'speed of repetition'.
It may be interesting to take a look at the front page of bustimes, which now lists the number of buses it is tracking at morning peak tomorrow and see how many vehicles might need fitting (discounting the PVR in London, which LOTS recorded in March 2024 as 7353).
Those seeking to complain to the Traffic Commissioners are, in essence, doing so for their own virtue. There is currently such a significant backlog of registrations (believed to be into four figures) that the TCs have had to issue formal guidance to operators as to how to proceed. There is anecdotal evidence there is also a delay in processing other mandatory information that were the operators not to have submitted it would be a public inquiry ground. Any suggestion that there would be penalties imposed on operators for not having Audio-Visual displays is as impracticable as it is inappropriate.
What's more, the TCs are obliged to perform a "balancing exercise" before handing down any punishment. I can quite imagine that even if they were to take the initial steps, as soon as the operator produced communication from a manufacturer saying they weren't interested (words to that effect, naturally), the case would be dismissed pretty out of hand.