Phone recording

Whilst trying to sort out an employee dispute between clinet and his employee (i know, stupid me!) the employee recorded the conversation that took place between us, ie: myself and the employee. I was only acting as an intermiediary to solve the employee dispute. Now employee has put in tribunal case for umfair dismissal and threating to use our recorded conversation as an evidence.

I only acted in personal capacity to get them to reach an agreement and now have been drwan into this unwillingly. Where do i stand?

Many thanks in advance