Buying with partner. How do I protect my deposit money?

[NavyCurtains]

My partner and I are buying a house together for the first time. We're not currently married, but engaged.

Thanks to the sale of my little one-bed flat, I have a substantially larger amount to put towards our deposit.

Me: 70k
Partner: 10k

Obviously, in an ideal world, we will live happily ever after. However, I'm a realist and know that marriages/relationships can break down. So, I'm being sensible.

How do I ensure I protect my £70k (and equally my partner protect his 10k)?

Get the percentage ownership to reflect that?

Speak to your solicitor when you are buying and ask them to set up a deed of trust.
You can either do it by % or fixed amount.

Do you want your £70k back or what it represents eg maybe it is 25% of the full value of the property

https://ridleyandhall.co.uk/should-you-as-a-joint-buyer-of-a-property-ringfence-your-deposit/

Deed of trust. DH and I have similar from when we first bought. Didn't want split percentages as we have been paying in equally since we bought and share all other costs. D of T says that if we split, we both take our original deposits back then split the rest 50:50.

Deed of trusts do work but beware. Once you're married if you divorce the judge will take it as evidence but necessary follow it.

Thanks all.
Deed of Trust sounds like the right option over percentage ownership. We'll both equally be paying the mortgage/bills etc.
So, if anything were to happen in the future, I'd want my £70k back, my partner to get his £10k back and then we split the rest 50/50. Sounds fair.