First a sidebar…I didn’t know Dominic Lawson was Nigel Lawson’s son. I used to l read his books avidly until he started working for the mail. If he’s Nigel’s don, he must be Nigella’s brother.
Never knew that…
With regards to the treatment of his granddaughter - it seems harsh, but I assume the bank was concerned about section two of the ‘Money Laundering, Terrorist Financing and Transfer of Funds (Information on the Payer) Regulations 2017’:
https://www.legislation.gov.uk/uksi/2017/692/contents/made
As evidenced elsewhere - regular account holders have had their accounts terminated due to the Act…brought in by this government!