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Screenshot on the left: O'Sullivan & Hilliard's The Law of Contract (2018 8 ed). p. 328.
Right: Paul Davies. JC Smith's The Law of Contract (2018 2 ed). p. 466.
To what does the red underline refer? It can't be the green, as the green appears in Davies's definition of estoppel.
'The former' means the first part of the green:
the mistake ‘must be one calculated to benefit’ the non-mistaken party
or to be detrimental to the mistaken party
Estoppel works to prevent harm to the misled, not to prevent benefit to the misleader.
