Oh, dear, I'm unhappy about the quality of the information
that I'm culling from my online searches.

There was the Canadian cable network that was said to start
October 6 with the first episode.
And I can find no evidence whatever that this happened,
so I think the information was wrong.

There is however another website that says:

Episode 1         13th Oct '19 8:00 PM
Episode 2         20th Oct '19 8:00 PM
Episode 3         27th Oct '19 8:00 PM

not the Canada network,
but BBC One itself in the UK.

we will see...

(well, I won't see, as I'm in the US)