As the fence is on your offside, then you cannot have been in the one-way part of South Street. You were therefore in the section from Russell Street, where the one-way section starts, to the bend, 6 parking bays in total within a much longer, internally divided, parking place with the restriction for its whole length of 'Permit holders only Mon-Sat 8am-6pm'.
GSV shows 3 traffic signs within your 6-bay length.
Are these facts correct?
We can't see a traffic sign in your photos, but they're yours, aren't they?