There are no such statutory obligations. The Communications Act 2003 requires that the coverage of the digital terrestrial television multiplexes carrying the public service channels1 should substantially match the coverage of the comparable analogue services, which is estimated to be 98.5 per cent. of UK households. Ofcom has included this condition in broadcasters’ digital replacement licences and multiplex licences.
1 All BBC channels, ITV1, Channel Four (main channel only), Five (main channel only) and S4C.