BoE Governor Mark Carney meanwhile said that should Britain vote on June 23 to leave the European Union, the country risks suffering a "technical recession", or two successive quarters of negative growth, as jobs disappear and the value of the pound slumps.
The Bank of England, presenting its latest economic projections alongside a routine monthly policy decision, said there were "increasing signs that uncertainty associated with the EU referendum has begun to weigh on activity".
Later addressing a press conference, Canadian national Carney said a recession was a possible outcome of a Brexit vote, although he gave no formal projections.
Prime Minister David Cameron seized upon the governor's comments, saying they sent a "very clear message" of the risks of Brexit.
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And finance minister George Osborne said following the BoE's updates that families in Britain "would face lower incomes because inflation would be higher, or the economy would be weaker with a hit to jobs and livelihoods".
The central bank today forecast gross domestic product (GDP) growth of 2.0 percent this year, down from a prediction of 2.2 percent made in February.
GDP was expected to hit 2.2 per cent next year, slightly down on an earlier forecast of 2.3 per cent, the BoE added.
"Given the economy's recent weakness, it is no great surprise that the forecast for GDP growth this year has been cut," said Vicky Redwood, chief UK economist at Capital Economics research group.