Oh by the way.(posted 7303 days ago)'Instructed an agent' in majority of cases doesnt mean much and is usually a bluff.
Also if you have never received a money judgement for this alleged debt - who are they to think they can demand your lifestyle and financial details by knocking on your door?
If you have nothing to loose (assetts) and are not worried by the thought of a potential CCJ (as you are financially linked this would also affect your husbands credit file) tell them to put anything they wish to discuss in writing and ask them to get off your land as they are tresspassing otherwise you will phone the police!