Elton John and Michael Caine have both starred in a new lighthearted NHS video to help persuade people to get their Covid-19 vaccination.In the 90-second clip, the music and screen icons team up to reassure the public that the vaccines are perfectly safe, while also providing a comic edge.John is seen pretending to audition for a part to promote the vaccination, and acts out having a jab before he eventually sings his seminal 1983 hit ‘I’m Still Standing’.But after several takes, an unimpressed