When are we on?

For the past 6 weeks the final series of Poldark has gone on at 9PM Sunday BBC1 However the final 2 episodes have seen a schedule sift The second last episode will go out 8PM on Sunday while the final one will go out the next day 8:30PM. Why the change? Some think that crime saga Peaky Blinders which has made from BBC2 has been given priority. We just have to see what the effects the changes have on Poldarl.