By Felix Keith Cricket commentator Alison Mitchell has flown back to the UK from Australia after being diagnosed with deep vein thrombosis. Mitchell, 44, had been working in Australia for the BBC World Service and local broadcaster Channel Seven, covering Australia’s Test series against West Indies. The award-winning presenter and commentator had been Down Under for months working, before experiencing the health scare and returning to the UK. She tweeted: “Well, flying back to the UK with Deep Vein Thrombosis wasn’t part of the plan. But so glad it got detected when it did. And the NHS has bee…