Gary,(posted 7596 days ago)I think Chris is right about being wary. A solicitor had the following to say about it........
"This can be a complex issue.
A beneficial interest can be gained if there is a specific agreement that one pays e.g. utility bills, e.g to allow the other to pay the mortgage. However, a general contribution to running cost is unlikely to produce a beneficial interest.
Also, the rules are different for different areas of the law - it is different in family law to insolvency law. In the latter, it is more difficult to gain a beneficial interest without having made a direct financial contribution to buying or improving the house, although a specific agreement as mentioned above may be enough. The rights of a non-owner in a family law situation are different - the non-owner is likely to have greater rights. We usually refer people for expert legal advice from a family solicitor or an insolvency practitioner
Re shortfalls, I think that it is very unlikely that a lender will try to pursue someone with no legal interest. If the house is in the sole name of one legal owner I have never came across a case where anyone else has been pursued unless there has been a specific guarantee involved.
I would have thought that Gary's partner is safe as long as she stays sole legal owner.
Hope this helps"
Mark.