STEPHANIE NEBEHAY  THE promise of COVID-19 vaccines is "phenomenal" and "potentially game-changing", Hans Kluge, the World Health Organization's regional director for Europe, told a briefing. Speaking from Copenhagen, he said supplies were expected to be very limited in the early stages and countries must decide who gets priority, though the WHO said there is "growing consensus" that first recipients should be older people, medical workers and people with co-morbidities. Britain approved Pfizer Inc's COVID-19 vaccine on Wednesday, jumping ahead of the rest of the world in the race to begin the most crucial mass inoculation programme in history. Prime Minister…