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What a coincidence — I got chatting to a chap riding a Thorn tandem with his daughter in the West End on Saturday morning and he told me exactly this. They were pretty brisk!
Ha! I wouldn't be surprised that the owner was clued up - Thorn make their opinions on the matter pretty clear. There's even another full page on their website about tandem braking with some maths, interesting stuff.
Ended up reading up on this recently. Thorn has an interesting bit of text on page twelve of their tandem brochure.