diff --git a/dotcom-rendering/src/lib/articleFormat.test.ts b/dotcom-rendering/src/lib/articleFormat.test.ts
deleted file mode 100644
index 7bdf17219ef..00000000000
--- a/dotcom-rendering/src/lib/articleFormat.test.ts
+++ /dev/null
@@ -1,22 +0,0 @@
-import {
-	ArticleDesign,
-	ArticleDisplay,
-	formatToFEFormat,
-	Pillar,
-} from './articleFormat';
-
-describe('formatToFEFormat', () => {
-	it('returns the correct FEFormat given an ArticleFormat', () => {
-		expect(
-			formatToFEFormat({
-				design: ArticleDesign.Feature,
-				display: ArticleDisplay.Immersive,
-				theme: Pillar.Lifestyle,
-			}),
-		).toEqual({
-			design: 'FeatureDesign',
-			display: 'ImmersiveDisplay',
-			theme: 'LifestylePillar',
-		});
-	});
-});
diff --git a/dotcom-rendering/src/lib/articleFormat.ts b/dotcom-rendering/src/lib/articleFormat.ts
index 4448839f441..b8ecd71d06b 100644
--- a/dotcom-rendering/src/lib/articleFormat.ts
+++ b/dotcom-rendering/src/lib/articleFormat.ts
@@ -1,5 +1,5 @@
 import { isString } from '@guardian/libs';
-import type { FEDesign, FEDisplay, FEFormat, FETheme } from '../types/frontend';
+import type { FEFormat } from '../types/frontend';
 
 export enum ArticleDesign {
 	Standard,
@@ -173,12 +173,6 @@ export const decideFormat = (format: Partial<FEFormat>): ArticleFormat => ({
 	theme: decideTheme(format),
 });
 
-export const getThemeNameAsString = (format: ArticleFormat): string => {
-	const themeName = Pillar[format.theme] ?? ArticleSpecial[format.theme];
-	if (!themeName) throw new Error('Unknown theme');
-	return themeName;
-};
-
 /**
  * We need a type guard because TypeScript enums are (confusingly)
  * returning both strings and numbers.
@@ -219,109 +213,6 @@ export const getAllDesigns = ({
 			design,
 		}));
 
-const designToFEDesign = (design: ArticleDesign): FEDesign => {
-	switch (design) {
-		case ArticleDesign.Standard:
-		// Correction doesn't exist in `FEFormat`.
-		case ArticleDesign.Correction:
-			return 'ArticleDesign';
-		case ArticleDesign.Picture:
-			return 'PictureDesign';
-		case ArticleDesign.Gallery:
-			return 'GalleryDesign';
-		case ArticleDesign.Audio:
-			return 'AudioDesign';
-		case ArticleDesign.Video:
-			return 'VideoDesign';
-		case ArticleDesign.Crossword:
-			return 'CrosswordDesign';
-		case ArticleDesign.Review:
-			return 'ReviewDesign';
-		case ArticleDesign.Analysis:
-			return 'AnalysisDesign';
-		case ArticleDesign.Explainer:
-			return 'ExplainerDesign';
-		case ArticleDesign.Comment:
-			return 'CommentDesign';
-		case ArticleDesign.Letter:
-			return 'LetterDesign';
-		case ArticleDesign.Feature:
-			return 'FeatureDesign';
-		case ArticleDesign.LiveBlog:
-			return 'LiveBlogDesign';
-		case ArticleDesign.DeadBlog:
-			return 'DeadBlogDesign';
-		case ArticleDesign.Recipe:
-			return 'RecipeDesign';
-		case ArticleDesign.MatchReport:
-			return 'MatchReportDesign';
-		case ArticleDesign.Interview:
-			return 'InterviewDesign';
-		case ArticleDesign.Editorial:
-			return 'EditorialDesign';
-		case ArticleDesign.Quiz:
-			return 'QuizDesign';
-		case ArticleDesign.Interactive:
-			return 'InteractiveDesign';
-		case ArticleDesign.PhotoEssay:
-			return 'PhotoEssayDesign';
-		case ArticleDesign.Obituary:
-			return 'ObituaryDesign';
-		case ArticleDesign.FullPageInteractive:
-			return 'FullPageInteractiveDesign';
-		case ArticleDesign.NewsletterSignup:
-			return 'NewsletterSignupDesign';
-		case ArticleDesign.Timeline:
-			return 'TimelineDesign';
-		case ArticleDesign.Profile:
-			return 'ProfileDesign';
-	}
-};
-
-const displayToFEDisplay = (display: ArticleDisplay): FEDisplay => {
-	switch (display) {
-		case ArticleDisplay.Standard:
-			return 'StandardDisplay';
-		case ArticleDisplay.Immersive:
-			return 'ImmersiveDisplay';
-		case ArticleDisplay.Showcase:
-			return 'ShowcaseDisplay';
-		case ArticleDisplay.NumberedList:
-			return 'NumberedListDisplay';
-	}
-};
-
-const themeToFETheme = (theme: ArticleTheme): FETheme => {
-	switch (theme) {
-		case Pillar.News:
-			return 'NewsPillar';
-		case Pillar.Opinion:
-			return 'OpinionPillar';
-		case Pillar.Sport:
-			return 'SportPillar';
-		case Pillar.Culture:
-			return 'CulturePillar';
-		case Pillar.Lifestyle:
-			return 'LifestylePillar';
-		case ArticleSpecial.SpecialReport:
-			return 'SpecialReportTheme';
-		case ArticleSpecial.Labs:
-			return 'Labs';
-		case ArticleSpecial.SpecialReportAlt:
-			return 'SpecialReportAltTheme';
-	}
-};
-
-export const formatToFEFormat = ({
-	design,
-	display,
-	theme,
-}: ArticleFormat): FEFormat => ({
-	design: designToFEDesign(design),
-	display: displayToFEDisplay(display),
-	theme: themeToFETheme(theme),
-});
-
 /**
  * Creates a string representation of {@linkcode ArticleFormat}. Useful for
  * logging, storybook UI etc.
diff --git a/dotcom-rendering/src/types/frontend.ts b/dotcom-rendering/src/types/frontend.ts
index dc25274da66..fe9ae5e60a4 100644
--- a/dotcom-rendering/src/types/frontend.ts
+++ b/dotcom-rendering/src/types/frontend.ts
@@ -172,12 +172,12 @@ type ThemePillar =
 	| 'LifestylePillar';
 
 type ThemeSpecial = 'SpecialReportTheme' | 'Labs' | 'SpecialReportAltTheme';
-export type FETheme = ThemePillar | ThemeSpecial;
+type FETheme = ThemePillar | ThemeSpecial;
 
 // FEDesign is what frontend gives (originating in the capi scala client) us on the Format field
 // https://github.com/guardian/content-api-scala-client/blob/master/client/src/main/scala/com.gu.contentapi.client/utils/format/Design.scala
 
-export type FEDesign =
+type FEDesign =
 	| 'ArticleDesign'
 	| 'PictureDesign'
 	| 'GalleryDesign'
@@ -206,7 +206,7 @@ export type FEDesign =
 	| 'ProfileDesign'; // FEDisplay is the display information passed through from frontend (originating in the capi scala client) and dictates the displaystyle of the content e.g. Immersive
 // https://github.com/guardian/content-api-scala-client/blob/master/client/src/main/scala/com.gu.contentapi.client/utils/format/Display.scala
 
-export type FEDisplay =
+type FEDisplay =
 	| 'StandardDisplay'
 	| 'ImmersiveDisplay'
 	| 'ShowcaseDisplay'