I thought that covertly recorded conversations were not admissible in court. That's what my union rep. told me when, as a teacher, I secretly recorded a parent I knew had been lying about me and making false accusations.
They are not.
Pre-divorce and I used to covertly record arguments with a view to using them as evidence. When I showed them to my solicitor she was horrified and said they would not be admissible and may count against my case. I asked if I could speak to a senior divorce solicitor and after a bit of stalling she agreed. I showed her boss and gave her my reasons for doing so. She agreed they are not admissible but said if I kept the recordings in a safe place, i.e. their offices, after making verbatim transcripts of the 'conversations', we could show the other party what evidence we had and it may help to strengthen our case for an out of court settlement. As it was I never got chance to use them so don't know what the result may have been.