Is the relocation permanent? If it is then your needs would be based on cost of living in your new location. If it is not , it would be reasonable for you to have the opportunity to purchase a property in the UK for you to live in at some point in the future. You may want to defer sale of the existing property if she wants/needs to live there. This would mean it is sold and you get your percentage share at an agreed point. You would have to see if she could afford to pay the costs of staying there.