Gbp/usd - 1.6720 ... Cable surged to a four-week high of 1.6735 in tandem with euro but traders are reluctant to enter big position ahead of the U.K. PPI data due out at 08:30GMT. Active buying interests fm st specs are building up fm 1.6700 down to 1.6670 with mixture of bids n stops placed below latter lvl n around 1.6650, while profit-taking offers (scale-up selling) are noted at 1.6750 n 1.6770/80.