Yep. Cellar temp does wonderful things to both Milds and Bitters.
This is the money comment, right here.
I brewed my first mild a few years ago and had it on tap (I just got my 1st kegerator and wanted everything on tap).
After a few pulls, I thought the beer was bland, thin, and a little metallic tasting. Very forgetable. So I brewed a session pale ale, put it in the kegerator and pulled out my mild.
The keg of mild ale sat out on the basement floor for the afternoon while I considered what to do with 3 remaining gallons of so-so beer. I had nothing to do that day, so I said "f' it," pulled the pressure release valve, popped off the lid, and poured the beer out of my keg into the widest pint glass I could find.
The wife and I watched a movie on the couch, and I ended up going back to fill up glass a few more times thinking "wow, this really improved!"
Anyways, temperature on a mild has a huge impact on flavor, and even mouthful.
Glad you enjoy it.
I'm looking forward to debuting a (slightly higher gravity, aiming for 3.8% instead of 2.8%) rendition of this recipe at 10 bbls. Although a half barrel pilot batch first to prove to my superiors that it'll sell.