If you like this, you’re going to love my other hits:
A dismissal is a dismissal is a dismissal
If you think they’re going to terminate your employment at the agreed end of a fixed term appointment, it’s still a dismissal.
If they move you onto another contract with disadvantageous terms, such as “take this fixed term contract to get out of the redundancy pool”, that also is a type of dismissal.
Talk to your union at the first imaginings of a dismissal in your future.