The British pound remains vulnerable on Tuesday, now relegating GBP/USD to the boundaries of 1.4200 the figure. GBP/USD weaker ahead of US calendar The pair has eroded yesterday’s gains and is putting once again the critical 1.4200 support under further pressure, amidst a prevailing risk-off sentiment and ahead of the key US ISM Non-manufacturing, Markit’s Services PMI and Trade Balance figures. Previously in the UK, Services PMI has matched initial forecasts at 53.7 during March, ticking higher from February’s 52.7. GBP/USD levels to consider As of writing the pair is losing 0.43% at 1.4200 and a breakdown of 1.4173 (50% Fibo of 1.3833-1.4517) would aim for 1.4051 (low Mar.16) and then 1.3833 (2016 low Feb.29). On the other hand, the next hurdle lines up at 1.4459 (high Mar.20) ahead of 1.4517 (high Mar.18) and finally 1.4534 (100-day sma). For more information, read our latest forex news.