I actually thought of Monach's HQ and mentioned it in the original post but then I deleted the paragraph when I was this.
https://propertylink.estatesgazette....ormer-in-luton
Seems that Monarch owned their building and the fact that it is up for sale/ to let as an office seems to remove it from the airports tender.
Their other office block is also up to let
https://propertylink.estatesgazette....9-12-387-sq-ft
So we are back to the airport HQ and easyjet