Personal legal documents are the written agreements and declarations that record arrangements between individuals, or between an individual and a wider party like a buyer, a family member, or a healthcare provider. They sit outside the world of business contracts and corporate filings, though some of the same principles apply.

In England and Wales, many of these documents don't have a strict statutory format, but they do need to meet certain basic requirements to be enforceable: clarity about who the parties are, what's being agreed, what each side is giving or receiving, and usually signatures with dates. Some documents, wills being the obvious example, have formal signing and witnessing rules set out in legislation that must be followed precisely.

Others, like a sale agreement for a second-hand vehicle, are much more flexible but still benefit from being written down rather than relying on a handshake. Getting the wording right matters because disputes often hinge on what the document actually says, not what either party thought it meant at the time.