As I understand it;- Essex, Suffolk and Camb's are all part of one mutually supportive consortium. Highly effective, and a well organised use of joint resources. Under the direction of one UEO ( Essex ). I believe that the arrangement with Kent is a separate agreement with Essex. Therefore it does not necessarily follow that if the Essex machine was off line that one of the other two machines would have to be deployed to Kent. I may be wrong on that, but it does seem logical.
I predict that eventually Kent will decide that the only really effective way to join the party is to bring a present!
Ol Grumpy!
AKA Tigerfish