Are you able to attach the title deeds and the plan?
Or an explanatory sketch?
The dotted line is used for clarity because there is no physical boundary for example where it crosses the passageway. The end property which is to the right of the hedge has the access over all the other properties but no one it appears has access over the end property. This is not unusual. There is no need for all the other properties to have access over 311 because there is no through right of way.
BUT looking at the photograph, it would depend on 1 how long the wall which is to the extreme right of the photograph which appears to be a mix of breezeblock and brick, has been in situ and whether there is any documented right-of-way right around the back or whether it existed once upon a time.
Looking at the land registry plan there is a solid line that end, below 311 on the land registry plan although it does appear that there is a passage down the side of 311 which would allow for access but not vehicle access.