1254 GMT - Sterling falls to a 12-week low against the dollar as the Bank of England's cautious stance on raising interest rates diverges from the Federal Reserve tightening policy. Markets are betting on further U.S. rate rises after the Fed lifted rates by 25 basis points last week and pointed to at least one more hike this year, supporting the dollar. In contrast, the BOE left rates unchanged last week and avoided strong signals about the prospect of future rate increases. Meanwhile, the latest U.K. purchasing managers' survey came in weaker than expected. Sterling falls 0.6% to as low as $1.3260, LSEG data show.