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You can buy the Cat Eye fork crown mount and fit the adapter to the Brompton fork crown mount (used with Brompton dynamos). Only costs a few quid and works well - cheaper than the 'official' while still using OEM parts - win/win.
EDIT: Okay it's a bit more than a few quid now:
https://www.tredz.co.uk/.Cateye-Centre-Fork-Light-Bracket_99372.htm
https://www.condorcycles.com/products/brompton-hub-dynamo-lamp-bracketSecond Edit: Sorry, misread, but the light is just a CatEye AMPP400 with Brompton branding? Can upgrade to the 500 and with the hack above, will cost like 40% less than the official kit.
Anyone selling the front mount light?