There's a police car (WX07VDG) outside Bike Bristol, helping to make sure nobody nicks a bike from inside -that being why all the bikes on the floor near the front of the shop have their stem loosened; to make them unrideable. With two police in the shop that won't happen.
Parking on the double yellow lines here is justifiable for two reasons. One, they were in looking at bike parts. Two, this is reserved for taxis, and as far as cyclists are concerned, Taxis are the enemy.