Most of you are talking as if airgun licencing is a matter for sensible discussion and weighing the evidence. It isn't. Its about politics, or to be more precise, votes. Sadly, I strongly suspect that overall, airgun licensing in England would be a vote winner, and if a few surveys and focus groups show that to be the case, you will be getting licensing whatever arguments you put forward and whatever party is in power.
The Brexit balls-up may get you off the hook for a bit longer, but I'm more confident that you'll have airgun licencing in five years time, than I am that we will have left the EU by then. You have some chance of shaping the details, but in my opinion, unless something changes in the near future you have no chance of stopping it.
Hope I'm wrong.....
Alan