Its Ours
As Ellie says, Gibraltar is indeed British.

LORE has it that it will remain British until the apes leave.

LAW has established it as British by the Treaty of Utrecht when the King of Spain agreed as follows

"The Catholic King does hereby for himself, his heirs and successors, yield to the Crown of Great Britain the full and entire propriety of the town and castle of Gibraltar, together with the port, fortifications and forts theunto belonging. And he gives up the said propriety to be held and enjoyed absolutely with all manner of right for ever without any exception or impediment whatsoever."
— John Wigmore, June 26, 2005

Doesn't Gibraltar belong to the UK, at least, till those monkeys disappear? They are called Barbary apes, I think??
— Eleanor Robb, April 11, 2005