Christine, if I read your post correctly you are saying that Halifax is threatening court action if your husband does not complete the I&E form. And the I&E form also asks about your financial details but you were not a party to the original mortgage.(posted 8149 days ago)If this is what Halifax is doing, you (ie, you - not your husband) must ask the Information Commissioner for an assessment of Halifax's action. You will need to say that your husband has completed the form with your financial details but not posted it pending the IC's assessment. The reason is that it is a breach of Human Rights Act to threaten someone into giving details of someone else's private financial details. But it only applies if your husband gives in.
An IC assessment of this is the first step. Personally I think a private prosecution of Halifax for breach of the privacy clauses of the Human Rights Act should then be explored but this might not work - it's a very new area of law.
Lee