These are the fruits of the sweet dumpling vine. Seeds that were given away free by http://www.growfruitandveg.co.uk/ some time ago; and were yet another squash experiment. A success, as they have never been grown before. Have moved from being a beautiful puce green, to pale cream and mottled. Exactly what it looked like on the seed packet.
The picture is deceptive as regards as size goes. They aren’t tiny, like the jack be little. But a nice handful, and very robust.