It's obviously sound advice that one should not trust a person who is being paid to gather evidence against you. And as it appears you have the right to make a recording, it seems like a good idea to avail yourself of that right.
It's quite another to imply, in a forum based on facts and evidence, that evidentiary recordings are routinely tampered with, despite the fact that such tampering is, in and of itself, a serious crime. I never met a fraud investigator at the DWP who cared enough about a case to risk going to jail.
If you believe you should be able to introduce your own recor