I wouldn’t hold your breathe on that one, Ed.
I suspect the UK MoD thinks it’s already given UK amateurs a generous allocation (which is much larger than the WRC-15 one). From the STANAG signals you can hear between our sub-bands I suspect the MoD has good reasons not to release more 5MHz frequencies any time soon.
I find it embarrassing when UK hams complain, with 20-20 hindsight, about non alignment with WRC-15 (when there are common frequencies), or that it’s not enough (when the current allocation is highly unused), or that we don’t have one continuous band.
We supposed to be qualified radio amateurs used to experimentation. Personally, 60m is one of my favourite bands and hope more folk are attracted to it.