However, I have in my possession bonds amounting to £9. I have written, emailed and rang NS&I numerous times explaining the situation – but the answer I get is 'without the bond holder's signed authority' they cannot disclose any information. I am presuming the holder was probably my father who died in 1999. Premium Bond prizes range from £25 to £1 million and are all tax-free. I have explained this to them and given an address where he lived when the bonds were purchased. They sent me form NS&I 71 – changing your details? Do I put heaven as his new address? All I really want to know, as an Executor, is there any unclaimed prizes for the bonds – which need to be dealt with or can I forget the £3 in bonds – as it has cost more in time and postage corresponding with them.