The UK hasn’t changed, same as is been for 100 years. Example; during WWII the NRA here in the U.S. asked its members to donate rifles to the UK so that their homeland defense would be able to make a stand should the Germans invade. Did the Brits learn from this and after the war relax its guns laws? Answer is no, got stricter in fact.
The first major gun law post-1945 in the UK was 1968, then 1988 and 1997.