Revert "Merge pull request #1989 from guardian/sass33"

This reverts commit e4a364e0e8a8b1d840045a28ebe422eb256712d9, reversing
changes made to 1c8a770588df41800836042ad085f7cb28289e3a.
Merge pull request #2000 from guardian/master-no-33

Revert "Merge pull request #1989 from guardian/sass33"