Star England batter Jonny Bairstow has credited his sensational run of form in the past five Test innings, including the two against India, to freedom from Covid-19 protocols and role clarity under new head coach Brendon McCullum.

Bairstow struck 106 and 114 not out to play a major role in England's seven wicket win over India in the rescheduled fifth Test which the hosts won here on Tuesday. Before that, he scored 1, 16, 8, 136, 162, 71 not out in the three-match Test series against New Zealand which England won 3-0.