A set of historic barns sold to a mystery buyer almost a decade ago are to go under the hammer. Repton Manor Barns, in Sir Bernard Paget Avenue in Ashford, are expected to fetch about £420,000 when sold by land and property auctioneers Clive Emson later this month. In 2015, the structures, one of which is Grade II-listed, were snapped up by an anonymous buyer for an unknown sum just before they were due to be included in a previous auction. At the time, the plot included planning permission to convert the historic ‘Long Barn’ and other former farm buildings into a restaurant or bar, coffee sho…