Stuart Lancaster says England are ready for World Cup after win over Ireland

• ‘Discipline was better, we controlled territory … we are ready’• Chris Robshaw sets sights on further improvement despite victoryStuart Lancaster cited the Twickenham factor as a reason why England will be hard to beat in the World Cup after they headed into the tournament on a winning note by beating the Six Nations champions Ireland.It is more than three years since any other European team won at Twickenham while World Cup group rivals Australia have lost on their past two visits to HQ. South Africa are the only side in the top 10 of the world rankings that England have not beaten since La…