From The Guardian:
Hugh Bonneville and Gillian Anderson play the Mountbattens in Gurinder Chadha cheekily Downtonised but watchable version of history
What does Downtonised mean? Google Web Search gives a few other contexts, such as this one, also from the Guardian:
While the US TV view of the UK is all Downtonised nostalgia, British telly is obsessed with documenting the extremities of America.
And from the Incorporated Council of Law Reporting:
It was almost as though the trial had never been won, and we’d been served a sanitised, Downtonised version instead.
I can't find a meaning in the usual sources. What does it mean?