Dad made redundant and now retired, what is he entitled to?

Hi all,

First time poster. My dad worked for Tesco and worked nights. Now the nights in his store has stopped, he was offered redundancy. He is 70, so he has retired. Can someone let me know what he is entitled to and what the next steps should be? I have looked into it already, but I do not want to miss anything, so any assistance or advice would be much appreciated.
I was told he might be entitled to a tax rebate but I would like to explore all avenues for him so he can have some further piece of mind.
Any help is greatly appreciated.
Cheers