On the JW website Ardrishaig is no longer listed as a congregation.
I'm also pretty sure Inverness had two congregation at one time. But I don't know how long ago it would have closed. A bit vaguer than that I also think Perth had three congregations at one time and Ardrossan and Stevenston had their own congregations (distinct from Kilbirnie). But I have no idea how I would verify any of that.
I have noticed that well over half of the congregations in Scotland collected less money in 2017 than 2016. I considered adding it all up but I don't know I can be bothered.