*BoE: World trade growth this year is likely to be the weakest for some considerable time

*Pound shows strength against majors amid BoE rate decision; now worth 0.8990 versus euro

*BoE: World economy appears to be undergoing an unusually sharp, synchronized downturn

*Pound declines against most majors as BoE trims key rate to 1.5% as expected; now worth 0.9020 against euro