She'd probably get in more legal trouble than her would-be assailant for carrying anything like that. The UK's fukt when it comes to self-defence.Carry pepper spray or some legal weapon for self defense. If you're a women, have one of your male relatives accompany you when you leave the house, it would help since most Islamophobes are too coward to attack men so they prefer to attack women instead. Also don't forget to recite your Duas when you leave your house.