0721 GMT - Yields on U.K. government bonds fall, tracking similar moves in their U.S. equivalents after the U.S. announced that they would double the size of their long-dated Treasuries buyback operation starting on September 9. In addition, Wednesday's U.K. inflation data showed a slowdown in services inflation, easing concerns about the possibility of aggressive interest-rate rises by the Bank of England. Ten-year gilt yields fall 1.4 basis points to last trade at 5.033%, Tradeweb data show.