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There are no IE specific styles in this application.
The govuk_frontend_toolkit defines some IE helpers here: https://github.com/alphagov/govuk_frontend_toolkit/blob/2011e77436fccd31f32a0a975a2bf4cc3b961495/stylesheets/_conditionals.scss#L67-L81
These rely on the IE6-8 specific stylesheets. We've ported almost all the formats now and we haven't had to override styles for these older browsers.