Walmart WMT.N and Target TGT.N, which report second-quarter earnings on Tuesday and Wednesday, respectively, have recently cut forecasts and warned inflation was squeezing margins and forcing consumers to reduce discretionary purchases. Aug 12 (Reuters) - U.S. retailers' earnings will give a glimpse into how consumers are dealing with sky-high inflation, and a raft of data offer a check-up on the health of the UK economy. Here's your week-ahead in markets from Sujata Rao in London, Ira Iosebashvili and Lewis Krauskopf in New York, Vidya Ranganathan in Singapore, Riddhima Talwani in New Delhi and Sumanta Sen in Mumbai.