I think that the fixings do appear to be under tension, very similar to your 1st pic, just thinking the apparent straight edge on the bottom right of the fixing. One almost straight across the road, the other going back towards Piccadilly. Also if you were going up to remove the decorations, would you also not remove the black strap fixings?
Did find this pic of the lights from 2013, which do show the lights in place over the bus stop. This site show the lights over Coventry Street from 2011-2019.
http://www.lightgb.myfreeola.com/xmas/xmas/london/coventrystreet/coventrystreetchristmaslights.htm
Also just a thought, ref scissor lift up bread, maybe removal of lights/decorations?
> There's also what seems to be a warship in view too.
Around the 1:20 mark there does appear to be a small boat leaving the warship and heading off to the left on the horizon.