Over the weekend I managed to get some filler wiped into the mortar courses and a couple of coats of Vallejo grey wash wiped in and wiped off. I was trying to achieve the look of worn old work-a-day goods shed and not the sand-blasted cleanliness of the preserved building in the country park. I still need to weather the roof, obviously make the windows and fasten on the stone capping stones.
The office isn't actually stuck on at the moment, hence the slight difference in angle and the gap in the wall.
Lots more to do but it is coming on nicely.