Can they give general address and / or previous address details to either an investigating officer for the planning authority (or an inspector in a planning public inquiry.) What are the potential penalties for contravening the act?
More information on the above exemptions is available here:
From what you have said, none of the exemptions appear to apply in your case and the post lady/Royal Mail should not disclose your address arrangements without your consent or without a court order.
Do any of these exceptions apply in the circumstances I have described? i.e. an enforcement officer gathering evidence to present to a planning public inquiry, or the actual inspector at that public inquiry?
If they have contravened the Act, what do we do then - I realise go to a solicitor, but what specifically will we be asking him/her to do? e.g. would we be asking him to "sue" them - what is the terminology?
If, they have not yet, (but we think they are going to), and we decide we want to put them off, (breaking the law). How is it best to proceed - send them a letter?