I understand and agree with this rule.....but with end spaces like this I am doubtful that a penalty could be enforced because you are not encroaching on another parking space. In fact you could say the left line is technically redundant, but is only there to keep continuity with the other lines.
If one was given a ticket then common sense would surely prevail if appealed.
I actively look for spaces like this and park exactly the same.
P.S. In case somebody says this end space could be used for a motorcycle, it needs to have a line either side to define the space and also needs to be marked for motorcycle only use by either a sign or painted on the road.