I assume the bond has matured and you are just rolling the money into a new bond.
You are opening a new account. The new bond will have a new account number.
When opening any new account, a bank or building society usually ask for an estimate of gross income. They also ask where the money for the investment is coming from e.g. salary, pension, existing savings etc. It is standard practice. There is no need to provide documentary evidence.
It is part of regulatory compliance called AML (Anti-Money Laundering) and KYC (Know Your Customer) to verify customer identity, prevent money laundering, and ensure financial safety. The information helps banks establish a baseline for your expected account activity, allowing them to spot unusual transactions.
As for getting hold of a P60, most big pension providers now have an online pension portal. You have to register to use them but it’s straightforward.
It means that if you have gone paperless for monthly pension slips, you won’t have a month 12 slip which usually has the equivalent data to a P60. You can get the data from the portal in advance of receiving your P60 in the post.
It’s helpful if you want to get your tax return in soon after 5 April, for example, if you have overpaid tax and are claiming a refund.
