http://www.digitaluk.co.uk/__data/assets/pdf_file/0011/42887/09715_DigitalUK_FlyerA4_LR9.pdfThe guide advises you to do a scan with the aerial unplugged before you start. Certain boxes/TVs will need to undergo a first time installation, factory or shipping reset first, to wipe the memory of the "wrong channels"!
In steps 5 and 6 it has blank boxes. These are for you to put in the UHF channel number for each multiplex from your local transmitter.
In most cases, you will should be receiving from Winter Hill, the main transmitter covering the North West. In this case, enter "62" in the box in step 5.
In step 6, enter 59, 58, 61, 55. One box will remain blank. This is because one digital multiplex will be used for HD purposes. There's no point manually retuning for that, because your box will not be Freeview HD compatible.
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and I also found this on a forum relating to Panasonic
Try these steps:
1. Pull the aerial socket
2. On the TV:
In digital mode, press menu.
3. Select Setup.
4. Select Tuning Menu.
5. Select Auto Setup.
6. Scan will find no services.
(this clears the memory of the wrong channels)
Beginning now with a blank template:
7. Select Menu & Setup.
8. Select Tuning Menu.
9. Select DVB Manual Tuning.
10. Enter the Winter Hill transmitter numbers (62, 59, 58, 61, 55. )