Nats have always been a bit slow in updating their external web stuff - I don't know why.
While Nats continue to lose contracts and generate the problem of staff wishing to stay within the company that have the right to do so any real recruitment (or existing staff moving between units for that matter) is on a bit of a hiatus.
I don't know why they keep recruitment open, but since it's web based it diesbt cost anything and then they have a queue or people who've shown interest and got so far when they finally decide they do need some more bods