(Reuters) - UK blue-chips gained on Friday, bouncing back from a near two-month low in the previous session, on optimism over signs of progress in U.S.-China trade talks.The FTSE 100 rose 0.4% by 0808 GMT, with trade-sensitive financials and miners leading the recovery. The FTSE 250 midcap index was also trading up 0.4%.U.S. President Donald Trump's comments that the trade talks were "moving right along" and China's decision to waive imports tariffs for some soybeans and pork from the United..