Sheppey's Oasis Academy boss Steve Chalke says decision not to vaccinate teachers is a 'mistake' | Updated: 16:21, 26 February 2021 Steve Chalke, the boss of the Oasis Academy which has schools in Medway and on the Isle of Sheppey, has hit out at the Government's decision not to vaccinate teachers. He called the plan a "mistake" and accused advisors of "experimenting" with the health of school staff. The Rev Steve Chalke at the Oasis Isle of Sheppey Academy, Minster In a Tweet he complained that if the government wanted to reopen all schools on March 8 it should protect staff rather than "experiment with their health."