No, it’s a proper street. Probably not usable if people park right up to the junction, though.
Just checked on Google Maps. It’s a narrow road with 10-12 flats/office units, but also access to the back yards and garages behind the larger streets on either side. If people can’t use it, it’s going to affect parking for several streets around.
No, that indicates the edge of the road, and that one can’t park aross the line i.e. with wheels on the pavement (aka sidewalk).
The Highway Code (official guidance, testable in a driving test) says that one shouldn’t park opposite or within 10 m of a junction anyway, though it’s not illegal.
