To be fair on the mother however, I'm sure she checked the rating, it said all was clear and bought it expecting to have a certain level of swearing removed. They allow some words like 'wanker' on the TV show, but anything stronger I believe would be disallowed. (yes the C word was a fake, sheesh.)
I'd also suggest that if he's the kind of kid who'd choose to play 'countdown' for fun, he's the kinda kid who'll be mature enough to handle a word like 'shit' without it destroying his mental state.
However, it shouldn't have been in there. How long would it seriously have taken to run a short list of 'bad' words thru it's internal dictionary? If nothing else, it could spark a demand for a national recall of the game and a demand for a censored version, which could cost them thousands, because they skipped over some basic bug checking, and play testing.
Countdown however is excellent, despite being a very slow, sedate show for old women, somehow it still draws me in and I can't see a line of letters on screen without trying to get a 7 letter word or better.
I'm quite the demon on the numbers round too
I still remember a Charlie Brooker episode where he showed an American 'focus group' some of our shows, like this, Bullseye, the Bill, and they just panned them all, because of the lack of excitement or big prizes. I for one can't see how Countdown could be hugely improved by having a £10,000 prize, some of it's charm is that you win a damn dictionary, for proving that you don't need one.