Ofcom is the ruling body for frequency allocation here in the uk,so they will be be the ones responsible for who gets the main contracts for 4g.
$g will occupy the frequency space left vacant by the turning off of analogue telly.But during analogue digital power was kept low to avoid interference with analogue,now the 4g signal will be a lot higher power than the original analogue so if in certain cases ie living close to a 4g base station you are going to suffer problems.
the solution to this might be a simple retune of your existing tv or set top box,or if you use a mast head amplifier ( many do )then you will need a filter to block the 4g signal.
The worst case scenario is you not being able to receive digital tv from your aerial at all in which case the 4g phone companies are obliged to fit you freesat free of charge and pay for the fitting of the necessary filters.
Keep following this blog for updates and how this will