Gbp/usd - 1.5167 ... Bank of England chief economist Spencer Dale said much of the impact of the BOE's asset purchase programme has yet to feed through to the economy, though the central bank is still ready to provide more stimulus if needed. Cable showed limited reaction after his comments n price maintained a firm undertone on dollar's weakness elsewhere. Bids are located at 1.5140/45, 1.5120/25 n further out at 1.5100/05. On the upside, offers are tipped at 1.5190/95 with some stops seen abv 1.5200.