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He is, in other words, a known quantity.

As opposed to the much more “easy reader” version, which is bringing the same sensibility to the same music and feeling stuck but giving your fans a known quantity they can eat and consume year in and year out.

But several former military and Pentagon officials said that Hegseth was not a known quantity in the Washington defence community.

It is worth stating the obvious too – while Sir Keir and Harris have never met, she is a vastly more known quantity and far more likely to be conventional in her approach to high office than her rival.

Donald Trump, she said, felt like a known quantity and like “a man of his word”, while Kamala Harris looked promising but still somewhat unknown.