Looking for a UK legal wog repellant?
Put into Amazon "ATUMTEK selfie stick".
You will find what is essentially an expandable baton of reasonable quality for 20 quid, totally legal to carry as it's technically camera equipment, but can pack quite a punch.
Just obviously don't extend it all the way for maximum force/durability.

>t. I recently bought one, it's very easily conceable in the waistband or deep pocket and a copper can't touch you for it.