Sterling tumbles nearly 1% versus dollar

Sterling slumped in American trade to the lowest since January 30 against the dollar, following earlier data from Britain and the US, the world's largest economy. 

As of 03:49 GMT, GBP/USD fell 0.68% to 1.4022 from the opening of 1.4131, with a one-week trough at 1.3987, and a session-high at 1.4151. 

Earlier UK data showed the services PMI for January down to 53.0 from 54.2 in December, missing expectations of 54.1. 

Otherwise, earlier US data showed the Markit Services PMI dipped to 53.3 in January as expected from 53.7 in December. 

ISM services PMI jumped to 59.9 in January from 55.9 in December, beating expectations of 56.5 with a wide margin.