UPDATE 1-Britain says opposed to strike on Iran "at this moment"

(Adds details) LONDON, Oct 26 (Reuters) - Britain said on Friday it wasopposed to a military strike on Iran "at this moment" over itsdisputed nuclear programme, arguing sanctions were having aneffect and diplomacy should be given time. The comments followed a report by Britain's Guardiannewspaper which said Britain had rebuffed U.S. plans to use itsbases to support the build-up of troops in the ...