Quote below from the article linked at post 487 above.
Kate Willard, head of corporate projects, said: "It was purely the air traffic control skills shortage that didn't get us over the line. Just that single thing, which is truly frustrating and I am so sorry. Everything else, including the infrastructure and construction, was - and is - on track."
Website seems to have been re-launched - can't see any mention of the airfield being closed.
‘It contains a misleading impression, not a lie. It was being economical with the truth.’