::::::::: REUTERS - UK NEWS :::::::::                    Sparks fly in Moscow as Russia, Britain trade accusations over spy poisoning          Hollywood actor Michael Sheen takes on Britain's high-cost lenders          Brexiteers dump fish in Thames to protest at EU deal          Scotland's female leaders tell Twitter - Clamp down on online abuse of women          Markle's wedding ring to follow royal tradition of Welsh gold          Flower power - Chinese artist hails east-west dialogue with petals          UK says RAF engineer dies in jet crash in Wales          Court rules in favour of case on Britain's ability to reverse Brexit          Soviet-era scientist says he helped create poison in UK spy attack row          Stephen Hawking to join Newton, Darwin in final resting place