May 19 Britain's biggest tile specialist Topps Tiles may target the commercial market once it has reached its goal of taking a third of domestic sales across the country, it said on Tuesday. Helped by new openings and improved stores and ranges, Topps Tiles has grown its share of the domestic market for six straight years to 30.3 percent at the end of 2014 and is aiming to take a third in total, possibly this year.