The law is not expected to take effect until 2014, since the Mexican Federal Congress will need to draw up secondary legislation to implement the new rules.

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The BBC's political correspondent Carole Walker said Ms Blears, Mr Hoon and Mr Purnell all appeared to have complied with the same rules which state MPs can nominate a secondary residence for capital gains purposes - and that this does not have to be the same as the designated second home on which MPs draw expenses.

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Due to strict rules entitling consumers to financial privacy, though, banks are limited in the secondary use of that data.

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Also, foreign languages have now been compulsory in the secondary school curriculum since 1992 and the literacy strategy means primary school children are now more familiar with the rules of grammar.

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If the Supreme Court rules against Kirtsaeng and in favor of Wiley, consumers who sell goods on eBay or any secondary marketplace could face copyright infringement charges for any products made overseas.

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