 Barratt Developments, Dr Martens, Experian LSE:EXPN and Severn Trent are the big names in Londons diary for Thursday, while US inflation will continue to hold the markets attention, with the publication of the producer price index, along with the first earnings from the major Wall Street banks. After US consumer prices surprised on the upside, sending stocks lower, Thursdays June PPI readings could continue the trend of weaker factory gate readings since a peak in March of 11.5. 