Clothing group Richard Roberts has closed a long-established Lincolnshire manufacturing plant, and is transferring production to other centres. The Straven knitwear factory at Alford, near Mablethorpe in Lincolnshire closed its doors on Friday. Many of the 49 workers at the factory had worked for Straven for more than 30 years. They became employees of the Richard Roberts Group last year, when the Straven Alan Paine business was acquired by the clothing manufacturer.