london speech italy prime minister theresa may create momentum brexit talk european union spokesman say monday non-committal whether would provide breakthrough british government say want ask may confident breakthrough current round talk spokesman say florence speech intend create momentum believe see momentum let see happen next round talk spokesman tell reporters government press may brexit plan would publish policy paper plan customs trade legislation britain leave bloc march 2019. also say prime minister leave weak ever party annual conference last week full confidence finance minister philip hammond foreign secretary boris johnson raft negative brief unnamed source local media wait talk say uk pm 's spokesman possible brexit breakthrough