By Matthew Abbott The NFL is getting ready for a Christmas Day bidding war as TV networks scramble for a £40 million deal. The Christmas Day games could bring in as much as £158m extra for the NFL as they plan to sell off the TV rights. TV partners have already promised £87bn to show games over the next 10 years and will soon get the chance to bid for the big-money holiday games. Last year, CBS, Fox and ESPN each showed one game in America, but this year one of these networks, or maybe Amazon Prime Video or even NBC, could show both games on Christmas Day. But, even though Amazon won the bid f…