I think he can record the meeting.
https://www.stephens-scown.co.uk/employment/employment-law-can-my-employee-record-our-conversations/
unless his contract specifically forbids it.
I will spend some happy hours reading the cases mentioned in the above link - Andrew Macshall recorded the police fed operatives and that was admissible ( but he lost the libel trial ) .
a doctor recorded the conversations with his elders and betters and the GMC did not turn a hair. One judge in a case I cant quote said, 'I see no difference in recording a meeting and having a secretary write notes as they occur'
another employee left his recorder oop 'on' when the employees were excluded so they could hear the secret discussions. Then he oops remembered were it was left - retrieved it oops and found and transcribed and then circulated the copies of the discussions. -oops not realising that three or four of the steps were obviously unlawful.
The employment judge threw the furniture around - I think you can see why - the employee has recorded a discussion he WASN'T present at and would not have been given permission by the any of the parties.
( short answer - you can record your own conversations)