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The last transmission of the BBC HD Channel promo is actually the morning of the 25 March through to the start of programming later that day. However, after the last programme at around 1.30am on the morning of the 26 (still to be confirmed) and the start of BBC Two HD programmes at 6.30am there is a gap and I made what would be called a ‘land grab’ for the time!

To say goodbye to the test signals we will be transmitting them continuously overnight!

To make it more interesting I have worked with BBC R&D colleagues to recreate some of the older test cards from a 30 line version through the 405 line era, on to 625, colour, widescreen and finally high definition.