Not at all sure of the Politics but it's worth bearing in mind that Signature are purely a Handling Agent and since selling off the maintenance side to Gulfstream they have no in house Maintenance Support.
Gulfstream, rightly or wrongly, are not encouraging in their support of the Netjet Hawkers and Falcons and may have lost the capability to provide warranty work on the aircraft. Harrods at least could provide maintenance support and have in the past (as Field Aircraft and Metro) been a Service Centrte for Hawkers.
Interesting though!
Mike Echo