Nick Pickles, from civil liberties group Big Brother Watch, said that when children leave home it is not uncommon for them to use their parent's address for their correspondence and bank account details.

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For others, it has been an absolutely vital way of ensuring private correspondence and, with more recent developments, being able to demand bank statements which allow privacy rather than relying on someone else to read them (perhaps a neighbour) at a time when confidentiality could be crucial.

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