About 25 pounds.
Yes there is no doubt about it.
no
Not legally.
No, the BF4 Beta is a separate download/installation.
Now
No, you can be any age to play Battlefield 3.
Go to multiplayer on the main menu
battlefield 3
Dice, a branch of Electronic Arts
It unlocks at 20,000 points
No you can't unfortunately.
Nope, sorry there is no spectator mode in battlefield 3.