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RXTVlog on Twitter (used to be called a516digital) has tweeted earlier today that all the BBC-A Freeview multiplexes are been being changed in the same way as done in Scotland to accommodate the BBC Scotland SD channel, and will therefore have space for an extra stream available. This process is apparently finished in most regions now.
Not sure I see the point as there isn't anything to fill it in the rest of the UK. Unless they used it to help with service differences caused by fitting in S4C SD in Wales.
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I looked it up. In Wales to fit in S4C it uses E4's space. So E4 uses space on a different multiplex than in the rest of the country. This space in the rest of the UK is used for Keep It Country (it used to be True Entertainment until it moved to a better slot). So if this spare slot was given to E4 in Wales then Wales would gain both greater coverage for E4, and Keep It Country added to their channels. Given More4+1 is on BBC-B (and before that it was Film4+1 before they found space for it on main D3&4 multiplex) the BBC is open to this sort of thing.