Yeah . It causes a few problems though .
i have to assume all 3 sides of the slab ‘leak ‘ . 2 of which are on my property. The 3rd though is this lane - owned by no one but caused all kinds of problems during planning . I can’t easily ( or cheaply ) close the lane . But ! I presume I could in theory did a narrow trench against the wall down to the 100mm original slab ....