Hello Gordon and welcome to the forum. I think you have properly identified it as a member of the squash family - possibly courgette or marrow. They all look fairly similar at first.
p.s. definitely not a triffid!
Cacoethes: An irresistible urge to do something inadvisable
Many thanks. Most likely from butternut squash or courgette seed (not a marrow) as we eat a lot of them. Hopefully a wee vegetable will appear before the end of the season!
What is this? Not planted so has come from a seed in my compost. Suspecting a squash of some description?
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It’s producing butternut shaped fruits but I think it’s a bit late in the season to get a ripe crop.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.