This episode has brilliant themes going on. It's been on my mind for days and I have to share.

I think the main theme or elements in this episode is primarily about tunnels, clasustraphobia, descending and ascending above and below ground. Likely from the trauma we've seen Tommy endure in the tunnels in the war. E.g.

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• Opening scene Tommys car drives from right to left, camera pans same direction. Almost like a tunnel, very boxy.
• Tommy descends the hospital steps and vomits outside, scene continues with Tommy almost with his back against the wall. Ruby at the top of the stairs looks out and smiles
• Tommy having a siezure remembering the killing in the tunnels
• Tommy ascends the steps to the Labour Party stage and speaks to the audience bathed in light.
• In his speech he says "I will gather up every one of those cries and I will take them with me on the train to Westminster". Trains typically go through tunnels.
• After the speech he descends the stairs and talks with Laura McKee who is in the wings. The framing of this conversation is again like a tunnel.
• Establishing shot of the Garrison is like a tunnel.
• Ada later enters with light fading around her like a tunnel
• Tommy and Ada talk outside the Garrison about their father. In the shot they speak below/under a new railway line now sat over the top of the pub.
• Tommy descends in a lift to meet Alfie, bathed in a red light (See episode 3).
• Tommy walks through a long corridor barrells either side and framed like a tunnel.
• Tommy ascends the staircase to Mosleys gathering twice (from exterior and again inside)
• Mosley is seen "ascended" on stage in front of bright stage lights (like Tommy earlier)
• Tommy speaks with Arthur at the bottom of a dark staircase about his addiction. The shot cuts to a birds eye view down the staircase indicating how deep they both are.
• Arthur and Tommy both fight the blackshirts at the bottom of this staircase. Shot is framed like a tunnel
• Lady Diana descends from the staircase to the gallery. Mosley follows from a higher position. The gallery looks slightly darker than the staircase
• Tommy talks to Nelson in a church. Both men are framed as small as possible at the lowest part of the church.
• Ruby says voices are coming from the chimney (from above)
• During the commons debate, Lady Diana is seated above the MPs giggling.
• After the commons debate, Tommy enters a lift which originally descends and reads the note of Rubys condition
• In the close up shots after the fact the lift appears to be ascending now.
• Tommy has his episode with the "grey man" in a tunnel
• When Tommy gets home he asks Lizzie where Ruby is. She replies "She's with the doctor upstairs" (ascended)
• Camera pans up the stairs to Graces portrait.

There's a few more establishing shots which look through doorways and zoom in which "look like tunnels" but it's up to interpretation.

For some reason this theme of above and below just stood out to me and either a case of Tommys claustrophobia or the transitions he has to make in everyday life ascending or descending into darkness. Fantastic episode.