The UK economy should grow a hefty 0.7 pct in Q3, according to a Reuters survey. That would be the same amount it probably contracted in Q2. There is a lot of uncertainty about just how strong the boost to growth will be from the Olympics, but most agree the Games will probably help drag the economy out of recession. More working days in Q3 compared with Q2 should also help. A 0.3 pct contraction overall is expected this year. The survey also forecast an extension of BoE QE to 425 bln pounds, probably in November, from 325 bln pounds now.