closure of COM7 for spectrum reallocation; this move allows the service to reach nearly the entirety of the UK.

Prior to launch, the majority of BBC Four's HD output was broadcast on the BBC HD channel, before its closure on 26 March 2013. In 2017, BBC Four HD, along with CBBC HD and CBeebies HD, launched in Ireland.

Programming

The first evening's BBC Four programmes were simulcast on BBC Two, with the first programme

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