It's the details on the build that are so impressive. The rear brake cable is routed inside the top tube. I phoned Mercian to buy some Framesaver, worried about the amount of rain that would make it's way in via the cable holes in the top tube. They informed me that there is a copper tube joining the cable holes, so rain can't get in - also make cable replacement easier.
I didn't think there were rear rack bosses. There are - they are on the inside of the seat stays, hidden away. etc, etc. Just so lovely.
For those who think steel is heavy, I estimate that this bike, as is (with fat tyres), is about 6-7 pounds lighter than my Dawes 7005 Al-framed hybrid.