Dan Walker and guests look ahead to the weekend's football action. It is a special day in the football calendar - the third round of the FA Cup, when all the big guns from the Premier League and Championship enter the world's most famous club knockout competition. The weekend's games feature a host of lower league and non-league teams who will be dreaming of a glorious and financially lucrative cup run. In Scotland it is derby weekend as Celtic host Rangers and Hearts face Hibernian.