First trailer for the final series of Downton Abbey is unveiled as Carson and Mrs Hughes' romance takes centre stage

<!-- rectangle --> The final series will air this September, and now Downton Abbey fans have got their first glimpse of the beloved characters bidding farewell. ITV aired the first full trailer during the first episode of the new series of the X Factor on Saturday night. Set to a tear-jerking rendition of Time To Say Goodbye by Lauren Aquilina, the one minute teaser features tears