Not exactly British Standard BS381C 389, Camouflage Beige to give the Hemp colour it's official name and British Standard number.
AFAIK, "Hemp" was originally a BS4800 ("Schedule of paint colours for building purposes") colour (BS4800 10B21) before being included in BS381C. However, 10B21 now appears to be called "Lizard Grey", which doesn't sound like the same thing...