Cows, I'm far from knowledgable about the agreement actually signed between the UK and the US. I might also point out that there's a new President responsible for this now - without trying to get this thread thrown into JetBlast, I'm sure the Czechs and the Poles are a little unhappy about now as well.
My personal opinion is that if sharing the codes was part of the signed deal, then the UK should get them per the contract.
If not, then not.
Other than that, I'm just enjoying the "we're not appreciated" parade.