New building projects are being put on hold with uncertainty "freezing clients into indecision", according to a new survey. Britain's construction sector slumped unexpectedly last month as new work dried up amid a "Brexit blight" of uncertainty, according to closely watched economic data. They came as, separately, the Bank of England warned that Brexit could pose a risk to the ability of British companies to borrow from European banks. Within construction, commercial work and civil engineering both saw marked declines last month while growth in house building slowed, partly blamed on anxiety over a possible coming interest rate rise.