NS&I customers have been urged to fill out a crucial document or face losing their Premium Bonds.

The savings bank, which is backed up by the UK Treasury, responded to a user on X, formerly Twitter.

Tagging NS&I, a customer wrote: "Hi, trying to download the premium bonds power of attorney form from your website but it's giving me the form for buying premium bonds for under 16s. Can you send the correct form and fix the link on your site? Cheers."

Responding to the Premium Bonds enquiry, the savings bank said: "Hi, Anthony. If applying for Premium Bonds as an Attorney, you would use this form as it is to buy Premium Bonds for yourself or your child under 16.

"We'd need you to complete the form with the details of the Donor, and supply the proof of the Power of Attorney on a cover letter (this can be either an original or certified copy of the Power of Attorney document, or a Power of Attorney access code which is generated for us)."

On its website, NS&I explains: "An Ordinary Power of Attorney is a legal document appointing one or more people (an ‘Attorney’) to manage the financial affairs of another person (the ‘Donor’).

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"It allows the Attorney to manage all the Donor’s affairs or it can be tailored to specific actions or restricted to a limited period of time.

"The Attorney and the Donor can manage the Donor’s affairs.

"In all cases the Ordinary Power of Attorney becomes invalid once the Donor has lost capacity. An Ordinary Power of Attorney can also be known as a General Power of Attorney."