I would guess the reason that skilled workers want the CCTV is because they still live in the poor areas but are considered "well off". Their vans, full of expensive tools worth several thousand pounds, are often targetted by theives.

The wealthier you are then the less chance you have of living near a bunch of scallys. But if you're a skilled worker then the chances are you live near to a poor area and are more likely to be a common target by thieves, etc.

Of course they could just ask them why they want the CCTV, then none of us would need to guess.

By the way, the skilled workers are also the first people the thieves try to sell the expensive tools to.