If you use the Freeview Light service from the Long Mountain and Llangynog transmitters, you will need to retune your Freeview box on 19th October 2011. Retune at 9am for Long Mountain and after 3pm at Llangynog.
If you use a relay of Long Mountain, you may have to wait until 3pm for the Freeview Light service to return, but you do not need to retune.
The changes are:
Long Mountain. BBCA gets a negative ofset on C60, moving to C60-. D3+4 moves from C52 to C53, after changes at The Wrekin, with BBCB moving from C56 to C57 for the same reason.
At Llangynog, BBCA moves from C62 to C50 to make way for 4G mobile services on C61-C62.