(Reuters) - Britain's FTSE 100 was at a loss for direction on Monday as a dip in miners and oil majors offset gains in bank stocks, while office group IWG pushed midcaps higher after announcing an asset sale. The blue-chip index ended a lacklustre session about flat, lagging its European peers, while the FTSE 250 held on to its six-month high with a 0.5 percent rise as a stronger pound also aided.The pound's gains followed upbeat comments from Britain's foreign minister Jeremy Hunt on talks..