Bizarre, just bizarre. Whatever the quotes are for the Boulmer CRC and RAFU Swanwick, I'll wager the members of those units are as confused as I am about the reasoning behind this decision - and I suspect ZH875 will be close to the truth.
Once GUARDIAN is delivered, Swanwick will become both a Mil ATC and ASACS Unit - the ASACS Resilience Entity at Swanwick will be the fallback for the Primary CRC at Boulmer, taking the place of Scampton, which will close. A bit more, therefore, than MPN11 intimates, but not a lot!