Britain’s biggest train company has warned passengers to expect disruption due to “widespread IT issues” which are also affecting banks, airports and broadcasters worldwide. Thameslink and Southern Rail, which service Kent, have said they are experiencing problems across their entire network. Govia Thameslink Railway – the parent company of Southern, Thameslink, Gatwick Express and Great Northern – issued an alert on the brands’ social media channels. The message stated: “We are currently experiencing widespread IT issues across our entire network. “Our IT teams are actively investigating to d…