UK Property Law
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The best way forward is to enter in to a cohabitation agreement with him, this is a deed signed by both parties which states whether or not each party is to have/accrue an interest in the house. It will also deal with other things such as property bought during the course of the cohabitation, debts, budgeting and payment of outgoings.
In order for it maximum likelihood of standing up in court they should both take independent legal advice on the document and be completely honest with each other about what you both earn.
She should avoid him paying any more than his share of the household expense and certainly not allow him to cover the majority of the mortgage payments to be certain of avoiding the possibility of making a claim but, really, a cohabitation agreement is the best way forward.
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