(1) This section applies to a disclosure -

(a) by or on behalf of a credit institution to another credit institution,

(b) by or on behalf of a financial institution to another financial institution,

(c) by or on behalf of a legal adviser to another legal adviser, or

(d) by or on behalf of a relevant professional adviser of a particular kind to another relevant professional adviser of the same kind.

(2) It is a defence in any proceedings against a person for an offence under section 49, in relation to a disclosure to which this section applies, for the person to prove that, at the time of the disclosure -

(a) the disclosure related to -

(i) a customer or former customer of the person (or an institution or adviser on whose behalf the person made the disclosure) and the institution or adviser to which or whom it was made, or

(ii) a transaction, or the provision of a service, involving both the person (or an institution or adviser on whose behalf the person made the disclosure) and the institution or adviser to which or whom it was made,