In hindsight this is so obvious it's embarrassing.
It may be that the ballcock washer is wearing out, but the clever apparatus is designed to be adjustable. There's a little screw at the top which controls the angle between the float arm and the bit which pushes down to close the valve. A slight turn with a screwdriver and now the valve gets closed more tightly as the water rises, which means that it will hopefully shut off the flow completely before the water level is able to reach the overflow inlet height.
If this doesn't fix it I'll have to figure out how to get in to replace the washer. Fingers crossed for now.
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