Go to custard = go pear shaped = non operational
An old one that some youngsters don't seem to know: SNAFU = Situation normal, all fucked up.
A specifically NZ insult: JAFA pronounced jaffa, = Just another fucking Aucklander (the rest of the country really loves Auckalnders)
Roger the expression 24 x 7 operation has been around in the computer industry for some time, I can't say for sure that thats where it originated but it seems likely.
By the way Kat how in your neck of the woods would you pronounce: "by taking the wrong route, the unit was routed."?