The loan, which was priced at 0.85%pm over an 18 month term, was completed in four weeks.
The 300-acre estate grounds contain a large Jacobean house and a medieval castle dating back to 1174 — one of the oldest dwellings in the country.
The property was purchased by a high-net-worth family, who are exploring a possible conversion of the castle and grounds for alternative uses.
Exit will be through refinancing.