If a contract contains a term which would exclude or restrict—

(a) any liability to which a party to a contract may be subject by reason of any misrepresentation made by him before the contract was made; or

(b) any remedy available to another party to the contract by reason of such a misrepresentation,

that term shall be of no effect except in so far as it satisfies the requirement of reasonableness as stated in section 11(1) of the Unfair Contract Terms Act 1977; and it is for those claiming that the term satisfies that requirement to show that it does.