Similar to the modern reboot of Sherlock, BBC has been testing the waters with only a few 90 minute episodes. I loved Gosford Park, and recently discovered Upstairs, Downstairs (Trailer), the remake of the incredibly popular series in the 70s. Starring Eileen Aikins, Keeley Hawes, Ed Stoppard, Anne Reid, Clair Foy, Adrian Scarborough, ARt Malik, Ellie Kendrick, and Nico Mirallegro.
A few other shows that have escaped my notice.
2008: Little Dorrit
2008: Merlin (Reminds me of Jonathan Rhys-Meyers in Gormenghast)
2011: Downton Abbey
Created by Julian Fellowes (Gosford Park) starring Hugh Bonneville, Maggie Smith, Elizabeth McGovern etc...