Originally Posted by
eglnyt
Would that be the system that failed in 2018 when they thought it had switched to the other centre but hadn't, and because the phones didn't switch over as expected, nobody could ring them to tell them?
NATS has a lot of redundancy and duplication and is currently investing in even more but please read the great explanations by others above as to why it might not always help.
Thankyou, & with respect, point taken!