However converting all the commercial multiplexes to use DVB-T2 would make sense, and still give people with older TVs access to the basic Freeview service of PSB (SD) channels.
The best answer is the Vaizey plan from 2011/12
Which was "at band clearance to mandate the PSB to emit HD only ...."
that would be a single change over until the despite if DVB based DTT
Save the broadcasters a lot if money ...
And STB for ALL those who need it ( NOT on hardship grounds) is easily funded by either the money taken back from the Help scheme after DSO ....
Or the pump priming that the government has allocated from project profit from sale if 700 MHZ band,
There are issues with over capicity of DTT bit rate .. and the wisdom of having a single (BBC operted) regionalised mux