FTSE climbs ahead of Sino-U.S. trade deal

(Reuters) - London's main index ended a choppy Tuesday session with slight gains, as investors looked towards the signing of the Phase 1 U.S.-China trade deal, while betting firms lost ground after Britain banned consumers from using credit cards to gamble.The FTSE 100 closed 0.1% higher. The FTSE 250 rose 0.2%, driven by a 9.2% jump in miniature wargame maker Games Workshop after reporting record profit and sales. Ahead of the interim trade deal on Wednesday, a source said China would ramp..