County Championship: Durham's Emilio Gay and Surrey's Dom Sibley strengthen England call-up prospects with centuries

England opener prospects Emilio Gay and Dom Sibley have strengthened their cases to be selected for the Test series against New Zealand with yet more County Championship runs.

Gay made 129 off 189 balls at Lord's - the venue of England's first Test in less than a month - as his Durham side finished the day on 530-8, giving them a 100-run first-innings lead against Middlesex.