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answer = buy marathon pluses
FTFY. I love the sound of crunchy bits of glass under my Marathon Plus tyres first thing in the morning. Ride quality's abysmal, but life is too short for fixing punctures on a Brompton.
And I know @edscoble will claim that fitting Marathon Plus tyres will make your Brompton explode in a fiery ball of death (until they changed the sizing) but mine hasn't.
4? All from glass in the tread on the rear. Standard Brompton rather than Marathons. Should probably spend more time pulling out the shards tbh but cba.