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Not unless that has been a sudden and unexpected change in the law it wouldn’t.
There are legal formalities required for a will to be operative. Failure to leave a valid will leads to intestacy. You don’t want to die intestate. Certainly those closest to you won’t want you to.
A simple Will is simply done. There are pro formas on the Internet. Remember it must be signed in front of two independent witnesses who must add their names and addresses.
@Velocio I think if you write something then record yourself as intended to be legally binding this would be sufficient in the absence of any other legally binding document