Hello and thank you for your question. I will be very pleased to assist you. I'm a practising lawyer in England with over 10 years experience.There are three principal options: the first if you propose to contibute towards the property equally is that you provide that each of you are entitled to the return of your capital and then split any profit 50/50.Or you can convert your contributions into percentages and provide that each of you are entitled to that percentage - this would require uneual contributions to the mortgage or it would be unfair to the smaller contributor.Finally if you want to provide for total flexibility and fairness you could provide for a floating shares trust which does not fix shares but rahter provides for how your shares are calculated based on contributions to ensure both parties benefit from what they put in.Any declaration of trust should be professional drafted as a deed or it may be invalid. The former two are simple to prepare, the latter is more complex and would be more expensive to draft.A solicitor should be able to provide for the first two options in a deed for around £125-200 + VAT and the latter for around £200-300 + VAT.Alternatively I can prepare a draft you can use for £70 for the former two options or £125 for the latter if you prefer.
Please let me know if I can assist you in further with the above.