By Ewan Murray Whether FA Cup replays are a good idea depends on who you ask. For Premier League sides, they are simply an inconvenience, eating into the top division’s winter break this season. However, for lower league opposition, they are enormous occasions, often providing some much-needed revenue. There will be eight FA Cup third-round replays this year, with seven Premier League sides in action and plenty of room for FA Cup magic. Here is how you can watch the FA Cup third-round replays on TV and live stream. When are FA Cup third round replays?With the fourth round commencing at the end…