Sterling has been boosted by expectations that the Bank of England will raise interest rates.
Dollar weakness after uncertainty about US trade policy has also been a contributory factor, traders said.
The pound gained more than 0.2% to $1.437, beating a previous post-Brexit-vote high set in January.
Sterling was flat against the euro.
The pound sank in June 2016 after the Brexit vote, hitting $1.2068 in January of last year.
But since the beginning of 2017 it has started to recover.>
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