Mediation - can the Defendant submit evidence that then can't be used in court

[cam69]

I am about to embark on mediation with a Defendant in a fast track court. We are currently at the pointing of submitting directions questionnaires.
I understand that discussions held during mediation are 'without prejudice' and therefore can't be used in court if agreement is not reached.
What is to prevent the Defendant producing vital evidence at mediation with the intent of ensuring that this cannot then later be used by me (the Claimant) later in court?
this feels like a great way to bury evidence that does not support your side of the case. What have I missed here?
Thanks

[2222]

I don't follow your point. If it's evidence they want to keep buried, why produce it at all?

[cam69]

My point is the opposite. If the Defendant brings up new evidence during a mediation session that either a) might support my case or b) might work against him then this will be inadmissible in court and so effectively buried by the process.
How can that help?

[2222]

They are supposed to disclose all relevant evidence. If you know about items they have not disclosed you ask the court for an order that they disclose them.

[cam69]

OK - thanks.