Aardvark JSFU (Joint Service Flail Unit) Mark 4 is a British-made Mine flail vehicle built by Aardvark Clear Mine Limited of Aberdeenshire, Scotland. The JSFU flail system was developed in Aberdeenshire by David Macwatt of Elgin, Scotland and George Sellar & Son of Huntly (system designers were James (Barney) Hepburn, Pat McRobbie and Alistair Birnie) with the cooperation of Ford Motor Co, Basildon. George Sellar & Son owned a number of patents concerning the rotor and chain design and electronic depth contouring system and manufactured the flail assembly. The armoured vehicle was manufactured by Glover & Webb of Southampton until their acquisition by GKN who continued to armour vehicles for a period before Penman Engineering were given the contract.