ReutersLONDON (Reuters) - Three polls on Saturday showed a rise in support for the opposition Labour party, although the governing Conservative party maintained a commanding lead. The polls showed the party of British Prime Minister Theresa May remained between 11 and 17 points ahead of Labour, still enough to deliver a clear victory as she seeks a mandate ahead of negotiations over Brexit, due to begin in the summer. However, the polls showed the gap had closed from leads of up to 25 points reported last weekend. One poll by YouGov showed the Conservative lead over the Labour had fallen to 13 points, compared to the 23 points that the same polling firm found last week. The YouGov poll for the Sunday Times found that 44 percent were set to back the Conservatives, down from 48 percent last weekend.