The coloured area on the map represents the locations where DAB reception should be possible in a car, or using a DAB receiver where the aerial is above ground-floor level. Those areas showing shaded with bright colour (one colour per DAB frequency) indoor domestic reception even at ground level should be highly reliable: please remember that the receiver aerial position and how fast you are moving can affect reception reliability.
This has been going on since Friday 16 January. Digital 1 and Edinburgh local MUXes seem to be very low power. Tested on a variety of receivers and in the car in NW and S Edinburgh. Have been unable to find details beyond the above post. Good old VHF to the rescue for now!