Mustn't grumble

There is a stereotype about the British, and perhaps especially the English, that we are unwilling to complain, and will put up with quite a bit of privation with little more than a few grumbles or, even, with the observation that ‘oh well, we mustn’t grumble’. We even sometimes seem to recognize this placidity as a characteristic of national political conduct, as when it is observed that if such-and-such ‘was happening in France then they would be on the streets’.Whether this really is generall