From now on, air rifles becoming collectable is purely academic. As we speak Scottish policemen are probably being told not to ascribe crime numbers to airgun confiscations/incidents unless absolutely necessary, so that in a year or so it can be "shown" that airgun licensing has worked. Then it will move South of the border. Will "collecting" be seen as good reason? Will having 83 HW35s, "all different" be seen as reasonable?
You might think I'm being overly sceptical, but my local force employed similar tactics to "prove" that the introduction of PCSOs had had a "marked effect" on low level crime.
The South of England has 2 good things, the M1 and the A1. Both will take you to Yorkshire.