Are in attendance any UK law concerning slingshots, and the power of them?
Catapults (slingshots) are not illegal in Britain, but if used or carried as a weapon they become unjust. You don’t have to justify why you are carrying one, but contained by town a police officer is likely to be suspicious. In the countryside it’s going to be rather different, even surrounded by a public access wood or moorland area, as using one for target practice or even hunting is legal On private property, your own or anyone elses (with their permission), you are clearly OK.