(For a Reuters live blog on U.S., UK and European stock markets, click LIVE/ or type LIVE/ in a news window) * FTSE 100 down 0.3%, FTSE 250 flat Jan 18 (Reuters) - London’s FTSE 100 slipped on Monday as a slide in crude oil prices weighed on energy majors, while tighter restrictions on businesses raised concerns about the near-term economic impact. The blue-chip FTSE 100 index fell 0.3% by 0803 GMT, while the domestically focussed mid-cap FTSE 250 index was flat. Oil heavyweights BP and Royal Dutch Shell fell close to 2% each as crude prices slid. Travel and leisure stocks, including British Airways-owner IAG, EasyJet, shed between 2% and 3% as passengers travelling to Britain are mandated to have a recent negative COVID-19 test and be prepared to quarantine at home for 10 days on arrival. As Britain presses ahead with Europe’s fastest rollout of COVID-19 vaccines, foreign minister Dominic Raab remained hopeful of some easing in lockdown restrictions in March. (Reporting by Shivani Kumaresan in Bengaluru; Editing by Subhranshu Sahu)