Wasn't it bmi who insisted on the name change from Teesside International Airport to Durham Tees Valley? Where is the Valley?
Such a silly name and no-one recognises it. It's no where near Durham. Try booking a ticket from PER to Durham Tees Valley and they say that it doesn't exist. Ask for Teeside International and it comes up on their computer.
Time to change the name again as it hasn't worked.