Hey there! i'm new to MGs too but have you looked into those battery maintainers that don't need to be plugged in? Heard they can be good for cars that sit a while. Might be worth checking out?
I keep my TF in the garage.  When it is not in use, I use the discarnect.  If I am not planning to use the car in the next few days, I connect it to a small solar panel  very similar to this .  the panel itself is outside the garage, above the door facing SW.  Despite sometimes not using the car for several months, my car hasn't needed the battery charger (or a new battery) for about 7 years.

Thanks to Cobber and Airportable for the tips re the radio.  I like the rechargeable backup battery solution :-)
 

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