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But I've also seen a few studies that were concluding that the Douglas fir had a (much?) more positive effect on top soil and humus creation than the European spruces, firs and pines that are also used in fast-growth forests (and that are often not indigenous either), with better nutrient composition. Their acidifying potential was also significantly lower.

An example I could find:

https://www.agriculturejournals.cz/pdfs/jfs/2013/09/02.pdf

I remember walking around Switzerland a few summers ago and was surprised to see that most of the tallest trees in the towns and parks were non-native American trees.

It's the UK, it's fine, it's not like its going to suddenly import hundreds of green tropical parakeets or anything...

For those out of the loop, this comment is a tongue-in-cheek jab at the fact there are 1000's of parakeet across the parks of London. Noisy buggers.