I have given up on sweet dumpling as it does not do well with me in Glasgow. There are much better ones for the North.
This para is taken from my website:-
Suggested quick maturing varieties of Winter Squash
The following varieties have all had successfully trials in Glasgow during a cool Summer, using the methods described above.
Festival F1. This is a very quick maturing variety that carries several, sweet tasting, small, pretty squashes. Each one is the right size for a family meal, some 1 kg, and could also be readily stuffed and then micro-waved. It is very good for storing and will regularly store into the next Summer.
Red Kuri or Uchiki Kuri. There is some dispute in the seed catalogues as to whether these are different names for the same variety or two different cultivars of the same variety. Red Kuri may be a redder cultivar. In any event, they are quick maturing with a good flavour, weighing about 1.3 kg each. Should store till late Winter.
Crown Prince F1. This is very tasty, having large blue/grey fruits each about 4 kg, and has a large quantity of useable flesh, and stores well into Spring.
Bonbon F1. This one came top in a recent independent taste test with a dry, nutty taste. Each fruit weighs about 2 kg and should store into the Winter.
This year I am trialling another 4 or 5 varieties in addition to the ones above and will let you know how they do in Glasgow.