Watched in 2020 - TV Series

Season 1 (24 episodes) (Rewatches)
Season 4 (22 episodes) (Rewatches)
Season 5 (22 episodes)
Season 6 - Episodes 1-3

Season 1 - Episodes 1+2

Season 4 Remix: Fateful Consequences (22 episodes)
(I had only seen the original season 4 before)

Season 1 (6 episodes)

Season 1 (7 episodes)

Season 1 - Episodes 1-3

Season 1 - Episode 1

Season 1 (10 episodes)

Season 1 (10 episodes)
Season 2 (10 episodes)

Season 1 - Episodes 1+2

Season 11 (24 episodes)
Season 12 (24 episodes)

Season 1 - Episodes 3+4 (Rewatches)

Season 2 - Episode 5

Season 1 - Episode 1

Season 9 (22 episodes)
Season 10 (22 episodes)
Season 11 (18 episodes)

Season 3 (The Road to Istanbul) (3 episodes)

Season 1 - Episodes 7-13
Season 2 (10 episodes)

3 episodes

Season 3 - Episode 4
Season 4 - Episodes 3, 4, 6, 9 & 11
Season 5 - Episode 2
Season 7 - Episode 1 & 8

(Mostly rewatches)

Season 1 - Episodes 12+13 (Rewatches)

Coronavirus: After the Lockdown

14 episodes (partly rewatches)

7 episodes (mostly rewatches)

Season 1 - Episodes 5-18 (Mostly rewatches)

Mini-series (3 episodes)

Season 15 (20 episodes) (a couple of them were rewatches)
Season 16 (20 episodes) (a couple of them were rewatches)
Season 17 (20 episodes)

Season 1 (6 episodes) (Rewatches)

Season 2 - Episodes 4-8 (Rewatches)
Season 3 - Season 3 (7 episodes)

Season 26 - Episode 15 - Aired 10/1-2020. Guests: Miriam Margolyes/Daniel Radcliffe/Alan Cumming/Sharon Horgan/Craig David.

Season 1 - Episodes 5+6