By Mikey Smith Tory Ministers have blocked £30 million in funding that could help a Labour mayor re-open a northern airport, the Mirror understands. Local Labour leaders have been working to revive the scuppered Doncaster Sheffield Airport, providing transport in the north a much-needed boost after Rishi Sunak ’s scrapping of HS2. They hoped to use a £30 million cash pot – originally earmarked in 2022 for a rail link to the airport before it closed – to help pay for building work at the site. But Tory Transport Secretary Mark Harper has refused to let them re-route the cash – which will likely…