alphagov/govuk_frontend_toolkit — pull request #141 by gemmaleigh (2014-10-28 11:43:40+00:00)
Title: Remove $ignore-for-ie: true to set auto margins

IE stylesheets then render the following where %site-width-container is
used:

margin: 0 15px;
margin: 0 30px;
margin: 0 auto;

So the auto margin overrides the left and right margins.