Sterling drifts higher ahead of central bank meeting

LONDON (Reuters) - The British pound edged higher on Tuesday tracking some lingering overnight weakness in the greenback though election-related uncertainty capped gains.Weak PMI data on Monday also muted any expectations of policy changes from the Bank of England at a policy meeting this week.The PMI data showed that construction shrank for the sixth month in a row in October - in line with expectations and reflecting a slowdown in growth due to political uncertainty before UK Prime Minister..