Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first
I am sorry about that - some of my text was lost!
Do you intend to start divorce proceedings?
If you want it to be fully legally binding then it needs to be a Final Financial Order within Divorce Proceedings.
However if this is not something you wish to do at this stage then yes you can prepare a Separation Agreement
and there is a template here
(there are others)
However if you wish it to be as enforceable as possible you should both have separate direct legal advice on it
Please ask if you need further details