We are all 15. Me, my girlfriend, her best friend and my best friend all want to go for a camp out somewhere, any ideas of where you are allowed to camp out (We are from the UK)

You have to be over 18 or be with an adult who is over 18 to camp.

No camp sites will take 15 year olds in the UK, You will need someone over 18 with you.

Unless you known someone who owns a field nowhere

At 15, nowhere.

you are all Under age- you Must have an Adult with you