(For a Reuters live blog on U.S., UK and European stock markets, click LIVE/ or type LIVE/ in a news window) * FTSE 100 up 0.1%, FTSE 250 off 0.3% April 27 (Reuters) - London’s FTSE 100 edged higher on Tuesday, boosted by BP after upbeat earnings update, although the gains were capped by a slump in shares of Aveva Group following its CEO’s exit. The blue-chip index rose 0.1%, with oil major BP Plc gaining 2.8% as its first-quarter profit more than tripled from a year earlier to $2.6 billion. Its peer Royal Dutch Shell also climbed ahead of its results on April 29. The domestically focussed mid-cap FTSE 250 index fell 0.3%. Aveva Group fell 4.1% to the bottom of the index after its Chief Executive Officer Craig Hayman decided to quit.