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This paper examines the phonological leveling and diffusion of variants of /t/ in Liverpool, northwest England, and two localities in its hinterland. We show that lenited realizations of /t/, thought to be historically restricted to Liverpool, are increasing over time and spreading over geographical space. We explore Labov's (2007) claims that linguistic changes that progress via transmission, within a speech community, are reproduced in all their structural complexity, whereas changes that spread across speech communities, via diffusion, are “simplified” en route. We find support for these hypotheses. Using a comparative sociolinguistic methodology, we show that the linguistic constraints operating on the realization of /t/ as [h] in Liverpool have remained stable over time, while those in a nearby town—Skelmersdale—seem to have simplified. However, we show that not all speakers from Skelmersdale share the same …