This is a map of week average weekly income from thisismoney.co.uk that was originally linked to on another website.
http://img.thisismoney.co.uk/i/pix/2...ea_952x806.jpg
I think it highlights the market issue for CWL quite well.
The 1 hour drive catchment area for CWL is noticeably worse off than that for BRS. CWL firmly includes areas that fall into the lowest income group, whereas BRS is dipping its toes in the highest income group areas just east of Swindon.