Does the baliff/debt collector have to have proof pf outstanding debt?

Does a Baliff or debt collector have to have proof of the outstanding debt, and not just tell you randomnely that you owe such and such to somebody on his written letter head? Surely there has to be some proof of what is owed and a break down of this? Surely if the debt is 2 years old and he turns up at your house... show more Does a Baliff or debt collector have to have proof of the outstanding debt, and not just tell you randomnely that you owe such and such to somebody on his written letter head? Surely there has to be some proof of what is owed and a break down of this? Surely if the debt is 2 years old and he turns up at your house saying you owe XXX amount and you have 7 days to pay, firstly they have to prove that you actually owe the amount they say, and to the person who is claiming it surely he has to give proof to the baliff? Please only sensible answers. Thanks
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