callum dunn's brought me to the park that he and the other chaperones patrol after school. eyesight of the public. that is why green areas and big parks like this are often places where a lot of things will happen out of eyesight. callum says that because they spend so much time with the children, they get a sixth sense if something is wrong and can immediately detect if there is likely to be trouble. if it is a success, it is hoped the chaperones could become a more common sight elsewhere in and wales. a 16—year—old boy has been arrested on suspicion of murder, following the death of a teenager in west london. the victim — who was also 16 — was stabbed in a park in the hillingdon area but hasn't been formally identified. police are appealing for witnesses. returning to coronavirus now, and the spread of 0micron and of self—isolation for contacts, are affecting staff levels across the economy. i spoke to matthew fell, chief policy director at the cbi, about how employers will cope. this is set to be one of the defining issues facing business as we head into the new year. we