Payment on old estate

I have received a cheque for £2,200 from HSBC for an estate where probate was obtained in 2004! Completely out of the blue, file destroyed, both executors partners at our firm. Cheque sent payable to the two executors, one of whom has died.

The estate was liable for Inheritance tax in 2004 so does this mean I will need to do a corrective account and if so will interest be payable?

Yes. Depending on what the payment represents, you may also have to check the admin tax position for the estate. Apart from that, send Form C4, Form IHT30 and payment of IHT with interest to HMRC and hope there is something left at the end to pass on to the beneficiaries. You may be able to ask HSBC to contribute to the costs, if they were at fault.