There is not any specific case law which you would require to deal with this matter, what I mean was that it has been established through other cases, this is now the legal position of the courts when someone has made a substantial contribution to a property. You can't quote case law for these types of issues as no two are ever the same, there won't have been anyone in your exact position before so the court would deal with this on the merits of your own case specifically. This is exactly why we would always advise to try and resolve as much as you can (if not all) at mediation. If it does go to court then you will present all of your evidence to the Judge such as bank statements proof or purchases, bank transfers etc. (your representative will keep you right). The Judge will then take everything that has been presented into consideration and make a judgment based on the merits of you case specifically.
To find a mediator in your local area, use this site :
In order to apply to the court, you will need to fill out and send form C100 (copy attached) with a cheque of £215 payable to HMCTS to your local family court centre. Or you can ring the court and pay over the phone (or pay in person if you go directly to the court and pay at the counter). If you are on low income/have low savings you can apply for a fee exemption here:
Once you apply the court will list a hearing where you and your ex attends. There will be a family advisor there too (from Cafcass) and if arrangements can be agreed then a consent order will be drawn up.
I hope this information has helped. You can find a local solicitor who deals with this on the law society webpage which is;