A few points:
The breaking Defence article shows B's and C's at Pax River in 2011 rather than A's at Eglin. Am I being picky in wondering why they can't get the right aircraft and if the picture is representative of the rest of the article?
LO - to say the jet seldom lands anywhere but Fort Worth is plainly BS given the number of aircraft based at Eglin, Pax River, Nellis, Hill, Edwards and Yuma. I agree however that I am sure there is significant pressure on the program to get the aircraft to the UK.
The A and C have a different back end to the F-135 (obviously) so maybe that's a factor in what is flying and what isn't? I have no actual knowledge of the event but I'm sure it's being looked into appropriately.