The ‘Downing Street’ historian and headmaster, Anthony Seldon, has written biographies of seven British prime ministers: Margaret Thatcher, John Major, Tony Blair, Gordon Brown, David Cameron, Theresa May and now Boris Johnson. Getting inside the mind and court of each prime minister and with unparalleled access, he is well equipped to analyse and assess factors that define a great PM and premiership.

Anthony Seldon is headteacher at Epsom College and was formerly master at Wellington College.