Perhaps a mess
But guess who is responsible and will make it worse.
It's not just about the "price of kit"
1.4GHz to 2.5GHz is progressively poorer range and Indoor penetration.
2GHz to 5GHz is progressively no use for Indoor penetration
3GHz to 10GHz is progressively more line of sight (LOS).
8GHz to 86GHz is limited to LOS point to point links or very short range.
There are multiple bands from 1.4GHz upwards for Satellite, Astronomy or High Altitude Platforms, governed by International Treaty. Ofcom and FCC may think they can, but in reality they should not get "creative" on these.
S, L, C, Ku, Ka etc bands.
2.4GHz and 5.8GHz are pan European Licence Free. "Free for all"
1.8GHz., 2.1GHz, 2.3GHz 2.5GHz, 3.5/3.6GHz and 10.2GHz 10.5GHz are Pan-European Mobile phone, Mobile Data or Fixed Data.
1.9GHz Pan European DECT
Most of it Ofcom has to do the same as rest of Europe. They are too interested in minimising their work and maximising their revenue. Not enough interested in Spectrum protection or the Consumer or value of National Infrastructure. (PLT /Homeplug / CE mark enforcement on CFLs and SMPSUs ?)
Why Start at 1.4GHz rather than 790MHz?
Note: Staring into a live waveguide gives you Cataracts, but not cancer.