Seems good value: https://www.ebay.co.uk/itm/Brompton-Folding-Bike-S3L-in-Limited-Edition-Claret/292941431576?hash=item4434ab8318:g:2UwAAOSwtpJcR6DZ
£1000 new, not limited edition, only a 3 speed, few years old, £550 about fair
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Seems good value:
https://www.ebay.co.uk/itm/Brompton-Folding-Bike-S3L-in-Limited-Edition-Claret/292941431576?hash=item4434ab8318:g:2UwAAOSwtpJcR6DZ