Dylan Hartley will miss remainder of Six Nations due to upcoming knee surgery

• England co-captain due to have operation on Tuesday• Hooker expected to be back in action in four weeksDylan Hartley will play no part in England’s Six Nations campaign after it emerged he will undergo knee surgery on Tuesday. The England co-captain has not appeared in the tournament so far and will be out of action for at least a month.Hartley has not played since 21 December because of what Eddie Jones described as “wear and tear” and Northampton called a “grumbly knee”. It was hoped the hooker would be able to avoid an operation but he saw a surgeon on Friday and one is required. Related:…