What is this F tree used for?

Here is some photos of the F... tree on Hampstead Heath in London. It's been the scene of a demonstration recently. But can you guess what the "F" word is?

Friend tree. You sit on it to make friends. The council wants to charge for the privilege.

Fuck tree. You bend over it for obvious reasons. Some people aren't happy with that, some are.

Fruit tree. An ancient apple tree the council wants to cut down to stop kids climbing it in case they fall.

Free tree. It's a free speech tree, you can stand on it and shout about stuff you don't like. Mostly used by the far right to attack minorities.

Fido tree. It's the only tree in the UK at an angle that dogs can climb. They love it but the council says no after a chihuahua fell off.
What is this F tree used for?
What is this F tree used for?
What is this F tree used for?
Friend tree
Fuck tree
Fruit tree
Free tree
Fido tree
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Those of you with a dirty mind are right
What is this F tree used for?
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