Rockstarturk: The makers of the Grand Theft Auto games series made a pre-tax loss of more than £12.6m last year. Edinburgh-based Rockstar North listed £11.5m in exceptional items during the year to the end of March 2012, in accounts filed at Companies House.They included revenue adjustments on transfer pricing, which some firms use to account for revenue in different tax regimes. In the previous 17-month accounting period, Rockstar made £5.4m in profits. Turnover in the 12 months to March was just over £18m, compared to £25.8m over the previous 17 months. Rockstar, which spent £22.2m on research and development last year, is due to release Grand Theft Auto V in the spring.