If it's a terraced house then that will be a right of access to at least 1, and maybe more neighbours.
Next door to me is an archway and I have right of access through my neighbours yard into mine.
Now usually I only use that for taking my bin out - or if deliveries that I need round the back....but it is access. The neighbour did put a lock on the gate and didn't inform me, one week I couldn't take my bin out, however she came round beofre I saw here, and said she'd forgotten to come round and bring me a key for the lock.