As Monty Python's four Yorkshiremen would say, "You think YOU'VE got it tough".
Here in backward NSW Australia, we have to "renew" the registration on our vehicles every year. The cost is made up of 2 components:
1. Registration fee which was $63 for the Norton in Nov. 2015. (My ute ((pickup)) was also $63)
2. Tax. $59 for the bike, $456 for the pickup.
But before the vehicle registration can be renewed, we must pay a third party insurance premium to cover personal injury to anyone injured in an accident involving the vehicle which is to be registered. And we are required by our government to pay a separate premium for each vehicle. And the premiums are high:
$340 for the bike, $810 for the pickup.
For anyone with a stable of bikes the cost would be prohibitive.
I don't know how much could be saved by switching to "Historic" registration, which involves a change of number plates, but I recall when looking at it in the 90's for a classic car, the usage restrictions made it not worthwhile.