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We have a single Maclaren and it only fits if one of the rear seats is down and positioned at an angle - it's too long at 105cm folded to fit in the Grand Scenic boot. I guess you would need something that folded flat and square rather than long. When I had a KA which is a much smaller boot, a Graco would fit in the boot if placed on its side because it was squat and square rather than long iyswim.
I have now ordered my twin buggy. I tried a single maclaren buggy in the boot for length and it fit in easy on its side. So I have ordered the twin triumph with my fingers firmly crossed. From the folded measurements is just about double the width, so on its side it should fit...and i liked the colour (Scarlet!).