NHS
Seatbelt law
erm !!!!
Seriously though, we all know full well that the TPB are totally inept and useless at most things BUT, The bastards rarely slip up when it comes to ensuring their own safety, wealth, status and influence. Remember in 1914 to 1918 when you were only in your teens, we were in the biggest nastiest war the rich ruling tories could come up with, but they STILL managed to ban SW radio recievers and siezed thousands, and they siezed million of guns when they thought the UK may follow Russia with a soviet style revolution. The all controlling bastards always ensure that any risk to their lifestyle and influence is always very well protected.
Make a hostile noise about the Royals in much of central London and find yourself in broadmoor indefinately without trial, just section 8 and wallop your gone, You never hear of any cuts in the security budgets for protecting the ruling elite, They may sell the country out but they will ensure their own continuity. Protecting themselves from us is the only thing I'm sure they are expert at.
I think it was John Locke on one of the earlier forums who said every registered fire arms registered address was flagged on the PNC so if an incident occured at said address and cops were sent there they knew in advance that guns were kept at that address. Wont take much to use that PNC to print of a list for siezure, but again as you rightly point out theres no sure fire way of knowing.
All we can sensibly do is plan accordingly IE dont make fire arms and shotguns our primary hunting / vermin control tools, plan on bows etc, and when TSHTF if they dont sieze your guns then great but at least if you have a different primary system you wont get burnt.
My anti establishment paranoia will continue to keep me away from stuff that needs licencing