Hello, welcome to the website. My name isXXXXX can assist you with this.
It is possible to use evidence in civil proceedings which had been improperly obtained, as it sounds like this tape recording might have been.
You would not be able to take out a civil claim for them using the information in a personal injury trial I am afraid. The Court would be expected to address any issue of the wrongful obtaining of the tape in the personal injury proceedings.
Is there anything else you would like me to answer for you?