May I suggest that you contact women’s refuge- they will give you all the advice you need.
I did my own divorce so it cost me nothing to do the actual divorce but the same financial separation unfortunately you will need a solicitor for
Wandsworth has a one stop shop to advise you on domestic abuse etc - take their advice but do you not use their solicitors as they can be very expensive eg once instructed first help free - next stage expensive
I would also speak to social services, they have social services for older ladies. I don’t know this would be helpful but there might be some advice
I would definitely contact age concern -They would come and fill in forms for you
Good luck and big hug xxx