Oh don't say that @scroggin as mine have only just set fruit, they were supposed to be courgettes🙄, and I was hoping six weeks might be enough, if we get that long.
I'm sorry you didn't get more definitive answers to your butternut squash discoloration problem . I myself am experiencing the same problem in my front yard garden. However I did some research after reading one of your answered comments and found out it is called black rot fungus please check the YouTube link below. https://youtu.be/YOiYffRjCCI
I assume it was some sort of fungal rust. I gave up growing butternut squash but have had much more success with tromboncino. They seem pretty indestructible.
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These look pretty good. Fingers crossed a couple more set and we get an Indian summer so they’ve got time to develop.
https://youtu.be/YOiYffRjCCI