With the amount of grass you have to cut a robot mower sounds just the thing Steve and it could make the whole gardening experience less overwhelming, especially during the growing season.  
We don't have a great amount of grass now as Ray has over recent years endeavoured to make the garden easier to manage and part of the process was to cover one area with slate dotted here and there with flowers.  There are however still areas in the garden that  have to be weeded but nowhere near the amount you have to do.
Pleased to hear that you are 'on the up' again. X