[altis]

It should all go smoothly like this

In each region, consumers can expect changes to take place over a period of weeks. This could happen as follows:

* Messages appear on screen saying that from next month one analogue service (for example BBC TWO) will no longer be available
* On the named date, the analogue service stops and the digital multiplex carrying BBC TWO (and also BBC ONE, BBC THREE, BBC FOUR, CBBC, CBeebies) will move to the frequency channel vacated by analogue BBC TWO
* Shortly afterwards, messages appear on screen saying that some or all of the other analogue services are about to stop
* On the named day, or days, BBC ONE, ITV1, Channel 4 (or S4C in Wales) and Five stop transmitting in analogue, and the multiplexes carrying these digital services move to the frequency channels vacated by the analogue service

More info here:
http://www.digitaltelevision.gov.uk/