I do it anyway, don't need a jacket, if I see people up to no good ie illegal trial bikes, yobs vandalising public stuff, people rabbiting with dogs along the railway line ect I use my mobile and phone the police.
Although it makes you wonder why sometimes, people on a live railway line rabbiting who had gone over the fence, I phone police, operator asks me if they are kids, I don't see a difference, it's extremely dangerous and illegal, it was adults anyway, I don't see the relevance in whether they were kids or adults !!!!!