Sterling slid against the dollar in American trade to November 20 lows following earlier data from the US and amid a lack thereof from Britain.
As of 05:13 GMT, GBP/USD fell 0.54% to 1.3239 from the opening of 1.3311, with a session-high at 1.3325, and a six-month low at 1.3205.
Earlier US data showed the S&P House Price Index rose 0.53%, down from 0.84% in February, and missing forecasts of 0.7%.
On a yearly basis, prices rose 6.8%, same as before and beating forecasts of 6.5%, as traders now await GDP and payrolls data later this week.
An index tracking US consumer confidence rose to 128 in May from 125.6 in April, revised from 128.7, missing expectations of 128.00.