UK Property Law
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You can check the registered title of his property by downloading a copy of the register from the Land Registry and paying a £4.00 fee:-
A second mortgage (ie. a "charge") would be registered against the title on the Charges Register as a "Resitriction", it would also list the lender in question.
If a creditor of your partner has applied to have a debt upon which they have received judgement registered against the property then this would also be listed in the charges register as a "Charging Order".
As to debts which are not secured against the property I'm afraid you will have to rely on the honesty of your partner. The creditors will not give away the details of any agreements they have with him because they are bound to the Data Protection Act.
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