Your wife is correct! Doesn't always beep, though, so keep your eyes peeled!

Same here, too - gave me a bit of a turn, first time I saw it! Crying wolf.

This has a familiar ring to it - I went to collect my GT line from the dealer, assuming that all GT lines had CCS. Seems the dealer thought so too, as he tried to prise open the bottom flap with his key! Nothing doing, clearly, so BEWARE people!