[Keith]

I think only having one multiplex that supports DVB-T2 limits the HD channels on Freeview. In the short-medium term it would be preferable if all (or at least one) multiplexes except PSB1 & PSB2 migrated. Then eventually just one of these two remaining as DVB-T to provide a basic/legacy service, with the other having national capabilities.

But the Vaizey plan was to,make PSB emit HD only in all platforms
Which moves the technology of tv forward by (sensible) intervention.
As I mention elsewhere a sensible solution was a PSB regional mux ..
(roughly what PSB B is about to be plus some BBC local,radio )
And a PSB national mux being other BBC s4c Alba and BBC uk radio maybe uktv
And PSB UK. Wide mux with the daughter channels on.
That is just over 200 coders compared to the about 450 we have .

But there are many commercial issues etc etc so there was a lot to be solved !

Maintaining  a legacy service for anything longer than a few weeks
Like we did at DSO is not a good way forward ….

I wonder whether these Freesat changes happening, combined with the need to save money might result in some changes/upgrades to the freeview multiplexes.

Presumably at present PSB1 and PSB2 both have to support regional TV, whilst broadcasting BBC One ITV1 respectively in SD via DVB-T. In theory if one of these was to initially convert to DVB-T2 and have only support for nations that would reduce the number of decoders required. Then longer term the other could be upgraded with just UK wide support, or nations if still required for advertising or other reasons.

The argument for keeping some form of legacy (DVB-T) service in the short-medium term is that not everyone can afford to replace their TVs to receive HD channels, as until a few years ago incompatible TVs were still being widely sold. I dare say by OFCOM (or whoever) dragging their feet on implementing the Vaizey plan this is less of an issue than it was a couple years ago, and in a few years' time if/when it happens even less as more people naturally replace their devices.