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Hello @PhilDAS I don't know the answer to your question but when I went from M to S, I had to replace the stem. I suspect because mine is a pre2017 bike.
If it is so close you may not have to play with the cables, but check it folds and unfolds!
https://www.thebromptonman.com/handlebars1.html#/
https://www.thebromptonman.com/cable-lengths.html#/
Arvy.
To part answer my own question, because I couldn't find any info online at all, I just measured.
A post 2017 M-type stem has the same reach as as the S-type at 220mm from the front axle. Not the 251mm the M-type used to have pre-2017:
I've also measured the height from the ground of the clamp and it comes out around 92cm so it's either exactly the same stem or very close.
So I'm going to go ahead and flar bar swap. Or possibly slight riser.