Dan Walker and guests look ahead to the weekend's big matches, including two mouth-watering derbies. Manchester City take on Manchester United in the lunchtime kick off, with City desperate to avenge their last-gasp defeat at Old Trafford in September. And Tottenham host Chelsea, looking to boost their Champions League qualifying bid while denting Chelsea's title hopes. There's also a look back at the best of the week's action around Britain, with some vital fixtures in the Premier League and SPL.