England ‘want to have a ruthless scrum’ against Wales, says coach Tom Harrison

Wales subdued England’s scrum in the second half in Cardiff (Simon Galloway/PA)

England want to develop their scrum into a “ruthless” weapon in time for the World Cup as Wales provide another important test of its progress at Twickenham on Saturday.

A major improvement in the scrum was evident during the Six Nations, when it emerged as the most effective in the tournament just months after being statistically the worst among tier one sides.