If you do move in together and later separate and your (ex) partner can show she has a 'beneficial interest' in the property she may be able to get a court to order that she is entitled to some of the proceeds of any sale, that she has the right to stay living at the address or, if you have children, that she should stay living in the address until the children are 18 if this is in the children's best interests......
A beneficial interest is a way of recognising any contribution a partner has made towards an address... For example if everything was in your name but all bills, including the mortgage, are split 50\50 a court is not likely to accept any argument you make that its 'your' home alone and is pretty likely to order you to hand over 50‰ if it's sold or may, if you have children, direct that mother should stay in the address with the children ......
My advice, if you do move in together, is to only split food and utility bills with your partner.....
And make it clear that this is the case.... Keep records......
If your partner is left with money 'spare' in this arrangement vs her current situation maybe agree that she will save/invest it for the future (say for example if you do decide to get married and/ or have children.... )
..... It would also be useful if you split up and she needs a deposit for a new place to rent (maybe don't sell it to her on this basis though!)
If you are only splitting the utility and food bills a court is less likely to consider you partner to have a beneficial interest.
With regards to children you are financially affected whether or not you are living together if you split up...... but as above could also end up losing the home you are paying the mortgage on in the worse case scenario if you are cohabiting .....
Ignore the comments about trusting your partner..... Simple fact is the overwhelming majority of relationships fail..... It's perfectly sensible to want to understand your financial position in a relationship and make plans in case it does all go wrong......
More info on cohabiting can be found here....
https://www.citizensadvice.org.uk/f...ving-together-and-marriage-legal-differences/