[OF1975]

Just one important point to clarify Portly_Giraffe regarding point 3:

3. The Home Office (outside of its immigration functions) is not an investigatory body. It is the role of the police to investigate allegations of unlawful interception.

While that may be true the Home Office does have an obligation to ensure that the police appropriately investigate crimes that are reported to them. The fact that the police have been obstructive when attempts have been made to report to them, that very clearly, imho, comes under the jurisdiction of the Home Office. They need to stop passing the buck and playing pass the parcel and get on with dealing with it.