Reporter: GrahamS
[Submitted to the original trac issue database at 10.07am, Wednesday, 27th April 2011]

The B shortcut sets the source or source:name tag based on the current background layer.

In Potlatch 2.0-14-gc925264 this maps as:
"OS OpenData StreetView" background --> source=OS OpenData StreetView
"OS OpenData Locator" background --> source:name=OS OpenData Locator

However the wiki at http://wiki.openstreetmap.org/wiki/Ordnance_Survey_Opendata#Attributing_OS suggests these values should contain underscores instead of spaces.

Taginfo shows the community is largely following the wiki:
166,945 use source=OS_OpenData_StreetView versus 79,636 with OS OpenData StreetView
21,934 use source:name=OS_OpenData_Locator versus 3,327 with OS OpenData Locator