Read on a bit Tom, & your get QUOTE:
"If any existing AM licensee wishes to increase transmission power,
they can make a proposal for a licence variation. Ofcom would consider such requests taking
into account matters such as interference to other services, the UK’s international
agreements and the circumstances of the original licence award." Unquote.

Yes there is a lot about wider bandwidth - it seems widening it to 9khtz, is the only worthwhile change, & that would depend on adjacent channels that are in use.

Reading between the lines - OFCOM are seeing a big loss of income from the "Big boys" no longer using MW - so they "have to be seen" to make MW attractive to any new users, otherwise it will look like OFCOM - who have a duty to make good use of the whole spectrum (EG sell as many licences as they can, within technical constraints)

I'm sure Caroline would not mind one little bit, in being a guinea pig in this aim, with 9khtz & 10kw.
OFCOM really have no excuse now the Big Boys have abandoned MW. Their big mistake in my opinion, as overall, MW goes much further with just one TX, for a given power, than FM or DAB ever will.
Those systems are OK in big towns & Cities, but are pretty useless in Hilly & woodland areas - I speak from personal experience, living in Thetford forest ! - OK AM does not have the high quality, but at least MW is mostly a solid signal & does not go silent or start Gurgling - as DAB is very good at !