Well, sorry to be the bringer of bad news ! There was a bay where you parked, but the council decided to remove it, so black paint was painted over the white bay markings. This at least is my view from looking at your photo. Painting over obsolete carriageway and car park markings with black paint is common practice, and normally becomes an issue when the black paint wears away.
GSV is very out-of-date for this location, (2015) but I suspect the bays on that side of the group have been removed to make for more manoevre space. Was the space behind you painted out as well ?