There's a local personal injury law firm running an advertisement giving away a Harley, a yearly event for them. A short time later one of regular advertisements ran that featured a photo of a horrific motorcycle accident.
I don't worry about repeatability. I usually go a long time between brewing the same recipe again and usually change something about it like different hops or yeast.
I've never used Muntons, but when I was doing mostly extract batches I routinely got 1.010-12 as final gravity with Briess, especially with the pilsner.