LONDON (Reuters) – British long-dated government bond yields moved to their highest since late 2018 on Tuesday, broadly in line with U.S. Treasuries ahead of a half-yearly budget update from finance minister Rishi Sunak due on Wednesday. February’s public finances data showed government borrowing last month came in well above economists’ forecasts in a Reuters poll, but downward revisions for earlier months mean borrowing for the financial year as a whole is below the last set of government estimates in October. Ten-year gilt yields rose 4.5 basis points on the day to 1.689%, their highest sin…