This extract from Hansard of January 1989 is sufficiently clear, it hardly needs further explanation:
Lord Morris My Lords, I share my noble friend’s concern or indeed apparent affection for a good potato salad, but does the question compare like with like?
Baroness Trumpington No, my Lords.
Lord Bethell My Lords, surely my noble friend would agree that an egg is an egg.
They were debating London transport by the way.
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