Just what Diego Costa needed: a guide to the traditions of the Premier League

That excitable but likeable hombre, Everton manager Roberto Martinez, took it upon himself to give a stern lecture to the Brazilian-born Spaniard Diego Costa after Chelsea’s sensational 6-3 victory at Goodison at the weekend. Costa, who operates on the field with the speed and directness of the bullet train and will bring Chelsea the Premier League title, I guarantee it, had indulged in a spot of mild gloating after the Everton defender Séamus Coleman, who otherwise had a fine match, had plonked the ball into his own net.