...when the B787 Dreamliner comes to LTN it cant get past the Easyjet hangar due to wingtip clearance
If its wingspan exceeds the B767-300 it would only be able to pass this point under tow - and that also depends on wingspan.
By the 'Link' I assume that you mean Taxiway Echo. To taxi along there under its own power, until the TUI building is demolished, it could only do so if it doesn't exceed the B757's wingspan. If it does, then it's a towing job and again, even this depends on the exact wingspan of the aircraft.
