That seems to be a driveshaft flopping out of the wheel arch at the front, so I guess he's doing more than changing his tyres. This is probably a sensible place to work on your car on a rainy day -- sheltered, lots of space, decent light, nice and level. Plus I think it's the Lockside Car Park and I reckon theyr'e closed for lockdown.
GPS Coordinates:
51.44751, -2.62056
Location: Hotwells & Harbourside