Hovis, Ben & Jerry's (Unilever), FM Global UK (insurance), and Morgan Crucible, are in Windsor; Nintendo UK is next to the Royal Mews Riding School. Centrica is in Dedworth, next to Windsor Racecourse. Groupe SEB UK (owner of Krups, Moulinex, Rowenta, and Tefal) is next to Windsor & Eton Riverside railway station and near the castle (previously next to Langley railway station until 2012). CA Technologies UK is at Ditton Park in Datchet, home of the former Radio Research Station until 1979, which discovered the ionosphere in the 1920s. Ledco, near B3020/A329 junction in Sunninghill and Ascot, is the UK distributor of LED Lenser torches, made by Zweibrüder Optoelectronics. Hitachi Europe, Corel UK, NSK Europe (off the A308 to the north), Weight Watchers UK (next to Desborough School), and The Rank Group (leisure) are in Maidenhead.