Calling the police might not directly help, but note that the bailiffs CANNOT force entry to your property without a warrant, that they must get from the police. If you call the police first, they will be more reluctant to offer that warrant and that will give you chance to explain before you end up with a break-in and stuff getting taken. Also, make sure to secure everything. Although bailiffs are not allowed to break in on their own, they ARE allowed entry through an open window or an unlocked door.
My Aunt very recently got a letter exactly the same as this. She contacted the police, and while the police said "it's not their business - it's a civil matter", she asked them to look into it before issuing a warrant to the bailiffs, and also to check up on the person in question on fraud, as giving out another person's address details IS a legal matter, and THEN the police can get involved. Suffice to say, the person in question was arrested, and nothing else has come of it.