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wonder if a manual one plus a cheap compact electric strimmer might not be the best route.
Precisely what I do.
Having a manual roller mower is great. Little bit of exercise, zero faff with cables or batteries. Also, if you get the cut right, the roller gives stripes. Don't get stripes with a flymo.
The strimmer comes out (very) occasionally to do the edges.
To be honest with a lawn your size, you could do the edges with a pair of scissors or some kind of edging shears.
My new lawn needs cutting so I need a lawnmower. It's got sleepers bordering three sides so I need something that will go right up to the edge and ideally lightweight and compact.