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Do soliciters advise on deeds of trust when buying a hosue or do they just put down what you think? - trust deeds uk

My friend and I are buying a house and trying to put into words what you get when we sell (in terms of gains and losses) that we are unequal partners. N solicits advice UK, what we agree on the circumstances, or just write what I think is right?

If people Are'nt lawyers on what I have to speak, advise?

Thanks