 After all the optimism engendered from their unbeaten start to the Six Nations this will go down as one of the most chastening defeats of Stuart Lancaster's regime.Error-strewn England set up a three-way fight for the Six Nations title with Wales and Ireland on the final weekend as they finally put away a dogged Scotland to retain the Calcutta Cup.The Scots had led by three points at half-time as numerous home chances were tossed away, and they remained in touch until the final five minutes after England failed to convert further golden try-scoring opportunities.