So what happens to the people currently employed to do these jobs?
They keep their jobs and we have 'extra' people doing it as well. Don't see the issue with that.
People do litter picking etc now, but how many times do you go to a park for instance and find litter/dogs mess etc? And extra million pairs of hands or so would make the UK a much tidier place to live.
It's not about what job they do, or who already does it, it's about getting people off the arse and into 'society'.