AFAIK, no.
Yes, but you need a licence and this is difficult to obtain. You have to be 18 and you can only get a gun licence for sporting purposes.
This gun was made in 1968
You cannot carry a gun in England, indeed you can be arrested on the spot for carrying anything more dangerous than a pen-knife. You also cannot own a gun unless you have obtained a licence to use it for sporting purposes, and you need to be 18 to do this.
This gun was made in 1948
This gun was made in 1952.
No
This gun was made in 1954
Your Sweet 16 should be a 1949 gun.
The serial number will identify the year of manufacture. Check the link below to date your gun.
You would have to ask every person in the world
No
Yes it is required.