It is advised by MG see handbook to only charge to 80% and to do a full charge to 100% around once a month to balance the cells in the battery this is a very general rule as so many things can depend and how you use the car if you are doing many miles each day then just charge as you need to, but as you are using the granny to charge I don’t think you are not doing a lot of miles each day.
There are several threads on here on this subject with lots of advice about it. just try a search
Les
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