Can anyone help with retuning a Wharfdale small flat screen tv dvd combo? Have no manual and it's mounted on the wall so cannot see model number. I can't find retune on the remote. I go to menu and shows picture quality etc but no retuning. We don't have normal tv channels just odd ITV3 and plus 5 etc. Maybe was not retuned when every thing went digital a few years ago! All help much appreciated! !