May 21 (Reuters) - British tile retailer Topps Tiles on Tuesday warned of persistent tough trading conditions after it posted a slump in first-half profit due to subdued demand in the domestic repair and maintenance sector.

The company, which has over 300 stores across the UK, said adjusted pre-tax profit for the 26 weeks ended March 30 was 3.1 million pounds ($3.9 million), compared with 4.4 million pounds a year earlier. ($1 = 0.7864 pounds) (Reporting by Aby Jose Koilparambil in Bengaluru; Editing by Varun H K)