It would appear that passengers on private charters etc have not been subject to Immigration or even Customs Controls for several months at Teesside. No wonder they keep on flying in.
Durham Tees Valley Airport says claims from Border Agency whistleblower are 'plain wrong' (From The Northern Echo)
Perhaps this was what Management were discussing in private. Their reponse seems well rehearsed and the memo was leaked to the Labour Party some time ago apparently.