[The Age of the Bristling Beard!]

32 minutes ago, Overread said:

I believe in the new Gotrek Audio drama/novels he doesn't speak very highly of Bugmans of the Mortal Realms. 

Though I've read/heard them I don't recall specifically, but he is generally grumpy about most things

I left out the part where it's watered-down in the free cities. 

[The Age of the Bristling Beard!]

It is on pg 19 of the new battletome. Bugman's Brew is mentioned as being in high demand. It's also stated that they also sell in Sigmar's free cities.