GL61 BGE is a red A6 S-Line 3.0 diesel which is still on the road today.
The video certainly looks like an RS6 and certainly shifts like one up to the roundabout which is when the wheel/tyre gives up the ghost.
Which would suggest false plates I presume/guess.
The dashcam is from a 3-series estate I believe - Number plate hanging off matches the video
And then they also did a Vectra/Insignia/Astra thing as well.
stolen fiesta on false plates. shown as sorn, no tax 1.2l fiesta. (st is 1.6l)