Back around 2000 my son purchased Post Office Bonds and made a few withdrawls up to about 2005.The balance in the bonds matured last year and he transferred them to a deposit account (30 days notice).He left our home address on the account as he is presently living in Northern Ireland.He has now been asked for Proof of Name,Adress and proof of PPs no..The only document he has is a passport but has no utility bills etc at this address and has no documents containing PPs no for a few years.Could anyone give me advice please.