Twitter to mock former Labour spokesman and press secretary Alastair Campbell after he posted a furious tweet slamming Prime Minister Boris Johnson over the "shambolic" state of Covid testing in the UK.The former footballer, 60, chided the GMB host, 64, for failing to spot a dropdown button while attempting to input his details for the online part of requesting a Covid test, after the ITV presenter raged at thinking he'd have to "scroll back" through "every day" of his life to input his date of birth.In view of his 719,900 followers, the former Downing Street Press Secretary posted an enraged tweet as he attempted to enter his date of birth as part of the Covid testing process.Alastair wrote: "How the hell are you supposed to register your.