Expert panel clears Serum Institute's Covishield vaccine, last step before regulator's approval; dry run in all states today; India-UK air travel to partially resume from 8 January; 15 flights to operate per week till 23 January; Record-breaking cold in Delhi-NCR, mercury drops to 1.1 degrees in Delhi; coldest day in 15 years; DM Pravin Kumar, who was allegedly responsible for post-midnight cremation of Hathras victim, transferred by UP govt and more.