Valli Holdings, parent company of Valli Opticians, says it has doubled the number of its stores in the U.K. by acquiring AH Mertons, a chain of seven stores in Lancashire and Cheshire. It has also nearly trebled its turnover. Run by Moin Valli and based in Huddersfield, the independent retail group has grown by acquiring one store in Yorkshire every year. It took over two more earlier this year. AH Mertons, which is also a family business, has been expanding by adding another store every five years. Its owner, Malcolm Jones, is leaving the company.