The claim is accurate. The Bank of England describes pounds, shillings and pence as the UK’s pre-decimal currency system, not as a system of physical measurement. GOV.UK’s weights-and-measures guidance is about units such as grams, kilograms, millilitres and litres. So Nigel Farage’s statement that pounds, shillings and pence are not weights and measures is correct. Sources: Bank of England, “Shillings to pounds converter” (bankofengland.co.uk); GOV.UK, “Weights and measures: the law” (gov.uk).