Avoid infinite recursion using custom sandbox benefit

Need to explicitly define a name.
Indentation
Make the flash message about basket total more friendly

And more consistent with the other flash messages that start "Your
basket ...".
Remove redundant heading on basket page
Regenerate CSS from LESS 1.7

No actual LESS changes, but the newer version of LESS emits floating
points with a different precision, hence the large diff.
Ensure price uses a large font-size on detail page

This was a regression due to some heading refactoring.