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@Gordon
Hi, thanks everyone for being so reasonable about this. I honestly never thought to check this - there are plenty of them that do have piezos, and the ones that I tested and opened were fine.
I can only assume it's one batch of watches that went out, and most of the others are fine.
If you have this issue, please post up here. I'll get in touch with the manufacturer and see what can be done but it'll be useful to see the extent of the problem.
In terms of the Piezo, it's safe to use any one. However they have voltages - if you put a 12v one in its going to be quieter than a 3v one (which I think is what they are using). I'll try and find out for sure.