What does “Downtonised” mean?

Question

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?

Answer 1

I believe it might be a reference to the British TV series 'Downton Abbey'. As such it would be referring to the style of the show and it's handling of the events it portrayed.

Sadly I only saw the first series so can't definitively say if its a good or bad thing to be, though your quote from icrl.co.uk implies it's not that great.