london foreign minister boris johnson accuse government statisticians misuse state data repeat pro-leave campaign mantra britain would extra 350 million pound week brexit figure central part campaign let take back control message suggestions money could instead use fund state healthcare johnson one prominent members campaign abandon pledge summer 2016 referendum eu membership david norgrove uk statistics authority say surprise disappoint johnson still quote figure confuse gross net contributions clear misuse official statistics norgrove say letter minister sunday say number quote include rebate britain receive eu include payments brussels support example agriculture scientific research johnson whose carefully tussle blonde hair apparent bumble manner make one britain recognizable politicians mention figure saturday newspaper article lay vision post-brexit britain settle account take back control roughly 350 million pound 476 million week write would fine thing many us point lot money go nhs national health service johnson late add surprise disappoint norgrove letter say base appear wilful distortion text article accord bbc britain control eu spend britain rebate part fund arrangement agree eu state johnson say figure publish office national statistics april 2016 show britain weekly net contribution eu 190 million pound week uk foreign minister criticize resurrect 'brexit benefit mantra