Labour gains in British polls, but May's party keeps strong lead

By Alistair SmoutLONDON (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.One poll by YouGov showed the Conservative lead over the Labour had fa