Hi Does anyone know where i can get a Locking wheel nut key for my alloys?

Ive lost it.

Cheers

Try lots of different size sockets and a hammer

Or the proper locking wheel nut removers.. doubtful you'd be able to get hold of a replacement

https://www.fiatforum.com/miscellaneous-guides/128372-removing-locking-bolt-without-locking-nut.html might be of help...