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They're certainly getting value from it. It was used for Andrew Marr's show this morning, and now for the Politics Show.
From what I have seen it is a pod (like a portacabin style) sat on the grass of College Green. Looks like it is double height. It seems fairly effective though I Harriet Harman did have a strange shadow at lunchtime. I guess though lighting in that environment is never going to be easy.
They're certainly getting value from it. It was used for Andrew Marr's show this morning, and now for the Politics Show.