I say chaps, aren't we confusing power and bandwidth? Bottom of page 3 of report states:-

"AM radio audio bandwidth

We will adopt the proposals set out in our consultation whereby Ofcom will consider, on a
case-by-case basis, requests from licensees to adopt wider audio bandwidth on their AM
radio transmitters. Such requests will only be granted where technically feasible, and where
they will not cause a significant increase in interference to other spectrum users. "