Just to add, I had family fly round trip recently CWL-DOH on 15th and 21st December and both flights were full.
I flew CWL-DOH on 18th and again was pretty much full. J was full expect for the 4 seats in row 1 which were empty. I would say Economy was at least 95% full.
I have more family taking this route in mid January to visit us so will be interesting to see how it looks after the holidays.
Looks to be doing well though.