You clearly thought wrong then! Neither hangar originally had anything to do with the Qatari Jumbo owners! The first was built specifically for VC10 conversions in the early 1990s and the other for Nimrod conversions in the early 2000s! Then the Nimrod hangar was used by BASCO for airliner maintenance when BAe took over the contract at Woodford before the 747SP eventually went in there. Cobham eventually had no use for either hangar so now the two 747s live in both! An opportunity the owners couldn't miss! The two hangars together could hold a dozen or so narrowbodies or around eight widebodies. There aren't many airports in the UK with that kind of capacity.