CITY economists expressed concern yesterday about the fragility of the UK economy after it emerged that&nbsp; Bank of England governor Mervyn King had pushed to extend quantitative easing (QE) by &pound;75bn earlier this month.<br /><br />Economists were shocked to learn that the Bank&rsquo;s policymakers had been divided over how much to extend QE.<br /><br />Minutes from the August meeting revealed that King and two colleagues argued to extend the asset-purchase programme by &pound;75bn, rather than the &pound;50bn that was voted in.<br /><br />The news surprised the market, which expected the vote to have been unanimous. Instead, it was a six to three split, with King backed by Tim Besley and David Miles.<br /><br />The trio argued that the potential risks attached to adding another large monetary stimulus might be &ldquo;less severe than the possible costs of acting too cautiously&rdquo;.<br /><br />But Citigroup analyst Michael Saunders criticised their stance yesterday, warning that too much stimulus could send inflation sky-high and accusing the Bank of &ldquo;flying blind&rdquo;.<br /><br />&ldquo;Amidst huge uncertainty, they would rather err on the side of too much stimulus&nbsp; rather than too little, and appear unconcerned at present that their approach could produce a messy exit strategy later on,&rdquo; he said.<br /><br />Saunders&nbsp; suggested that the economy could already be showing signs that the level of stimulus is too high, with asset prices rising and signs of an early recovery appearing.<br /><br />&ldquo;It is possible that these are signs that QE is far more powerful than we expected,&rdquo; he said.<br /><br />The minutes delivered the market&rsquo;s third shock this month, following the news of the QE extension itself and Tuesday&rsquo;s news that July inflation had remained level at 1.8 per cent.<br /><br />Analysts said that the debate suggests that the Bank expects rates to stay at 0.5 per cent for some time, and that the door remained open for additional asset-buying increases.