"If you're the license owner only, I would think, I know I cannot take DH's guns in my car any time, even to drop off for repair, as I am not the license owner."
Broadly, although there is a curious clause in the Firearms Act which says otherwise:
"11 Sports, athletics and other approved activities.
(1)A person carrying a firearm or ammunition belonging to another person holding a certificate under this Act may, without himself holding such a certificate, have in his possession that firearm or ammunition under instructions from, and for the use of, that other person for sporting purposes only."
Now, the interpretation of that section is grey to say the least. Does it mean it's okay for me to pass a cased gun to someone and say "go pop that in the boot of the car" as we're packing to go somewhere (so they're basically just carrying it down for me, broadly under my supervision), or does it mean it's okay for me to leave the keys in their possession and have them carry it in a car and meet me at a competition with it (for my use)?
Technically both are fine, but I think the view of the Police in 1968 when that was enacted would probably differ from the view of Police today! And I certainly wouldn't ask someone to carry a rifle on the train for me as the BTP have a reputation for not being entirely au fait with firearms laws (there have been cases of people being thrown off trains for carrying - entirely legal - firearms because the Police didn't actually know the law and thought it seemed like "the sort of thing that would be illegal". Which doesn't fill you with confidence!
"I am surprised!"
A lot of people are, which is surprising in itself when there's near enough a million certificate holders - one for every 70 - 80 people (odds are you know one, you just don't know it), and there's also an estimated 10 million airguns swilling around the UK unlicensed, so that's one for every 2 households - statistically a few houses on your road should contain airguns!
Rifle, Pistol and Shotgun shooting are all Olympic and Commonwealth sports We do very well at the Commonwealths and reasonably well at the Olympics. Beijing was a bit dry, but Peter Wilson won Gold in the Double Trap clay pigeon event in London.