The orthodox rules on validity of marriage at common law are that formal validity of marriage is governed by the lex loci celebrationis and essential validity of marriage (or capacity to marry) is governed by the personal law, ie the law of domicile. Neither the lex loci celebrationis nor the lex fori ought to have any interest in such questions of essential validity.
According to such orthodoxy there are two rules of English law that are suspect and in need of reconsideration. First, there is (arguably) the rule that the parties to a marriage do not need to have capacity to marry by the lex loci celebrationis when they marry abroad but do need such capacity when the marriage takes place in England. The second rule subject to attack is the notorious ‘exception’ based on Sottomayer v de Barros (No 2)2 which allows a foreign incapacity to be ignored when an English domiciliary marries in England, but not when the marriage takes place abroad.