Probably too late to change my mind at this point.
Concrete slab update: what concrete slab?
One down, three to go. I've decided to do complete removal and repair of the ground of one piece at a time so if I have to stop it won't look too amazingly untidy at any point.
@mike solid plan
Consider this a friendly, local pub. Make yourself at home, bring your friends, have a good time! Meet new people, have a laugh, enjoy the ambience, and the Oxford commas.