I want to create circles of diameter 20m in QGIS. I create a point and then use vector - geoprocessing tools - fixed distance buffer. My problem is that the size is crazy and worse, the shape is not a circle. My map units are metres and when I use a distance of 0.001 I get an oval 220 m high in north-south direction and 140 m wide in east-west direction.
I am using OSGB 1936 / British National Grid EPSG:27700. I have tried switching to another reference system and back again since in other cases this seems to make QGIS pay attention, but it has not helped in this case.