Yes, you do- air weapons in the UK require a firearms licence.
See the link below for the UK air gun laws. Sportsmarketing in Essex sells C02 air guns
Not in the UK
yes they can
no
No, you only need a driving license to drive it.
Yes
You didn't specify what the licence is for !
There air independent shops that repair air guns all over the USA and UK. Do a web search for "Air gun repair" or see the link below.
yes you need a provisinal licence and a cbt.
Contact your local police for a correct answer.
18
In the UK yes.