(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 0.6%, FTSE 250 adds 0.8% July 1 (Reuters) - London’s FTSE 100 gained on Thursday as a set of strong earnings updates helped investors look past concerns around rising COVID-19 infections in the UK. The blue-chip FTSE 100 index gained 0.6% after wrapping up its best quarter since 2019. The domestically focussed mid-cap index added 0.8%. (Reporting by Shashank Nayar in Bengaluru; Editing by Subhranshu Sahu) Our Standards: The Thomson Reuters Trust Principles.