diff --git a/dotcom-rendering/src/components/Masthead/Titlepiece/ExpandedNav/SearchBar.tsx b/dotcom-rendering/src/components/Masthead/Titlepiece/ExpandedNav/SearchBar.tsx
index 9b861fe9ebf..7d5275431ea 100644
--- a/dotcom-rendering/src/components/Masthead/Titlepiece/ExpandedNav/SearchBar.tsx
+++ b/dotcom-rendering/src/components/Masthead/Titlepiece/ExpandedNav/SearchBar.tsx
@@ -1,5 +1,12 @@
 import { css } from '@emotion/react';
-import { from, space, textSans15 } from '@guardian/source/foundations';
+import {
+	from,
+	palette as sourcePalette,
+	space,
+	textSans12,
+	textSans15,
+	textSansBold14,
+} from '@guardian/source/foundations';
 import {
 	Button,
 	Label,
@@ -7,6 +14,7 @@ import {
 	SvgMagnifyingGlass,
 	TextInput,
 } from '@guardian/source/react-components';
+import { useCallback, useEffect, useRef, useState } from 'react';
 import { nestedOphanComponents } from '../../../../lib/ophan-helpers';
 import { palette as themePalette } from '../../../../palette';
 
@@ -88,20 +96,209 @@ const searchSubmit = css`
 	}
 `;
 
+const searchResultsDropdown = css`
+	position: absolute;
+	top: 42px;
+	left: 0;
+	right: 0;
+	background: ${sourcePalette.neutral[10]};
+	border-radius: 8px;
+	box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
+	z-index: 1000;
+	max-height: 400px;
+	overflow-y: auto;
+`;
+
+const searchResultItem = css`
+	display: flex;
+	align-items: flex-start;
+	padding: ${space[2]}px ${space[3]}px;
+	text-decoration: none;
+	border-bottom: 1px solid ${sourcePalette.neutral[20]};
+	transition: background-color 0.15s;
+
+	&:hover {
+		background-color: ${sourcePalette.neutral[20]};
+	}
+
+	&:last-child {
+		border-bottom: none;
+	}
+`;
+
+const resultThumbnail = css`
+	width: 80px;
+	height: 48px;
+	object-fit: cover;
+	border-radius: 4px;
+	margin-right: ${space[3]}px;
+	flex-shrink: 0;
+`;
+
+const resultContent = css`
+	flex: 1;
+	min-width: 0;
+`;
+
+const resultHeadline = css`
+	${textSansBold14}
+	color: ${sourcePalette.neutral[100]};
+	margin: 0 0 ${space[1]}px 0;
+	line-height: 1.3;
+	display: -webkit-box;
+	-webkit-line-clamp: 2;
+	-webkit-box-orient: vertical;
+	overflow: hidden;
+`;
+
+const resultMeta = css`
+	${textSans12}
+	color: ${sourcePalette.neutral[60]};
+	display: flex;
+	align-items: center;
+	gap: ${space[2]}px;
+`;
+
+const resultPillar = css`
+	text-transform: uppercase;
+	font-weight: bold;
+`;
+
+const loadingText = css`
+	${textSans15}
+	color: ${sourcePalette.neutral[60]};
+	padding: ${space[3]}px;
+	text-align: center;
+`;
+
+const noResultsText = css`
+	${textSans15}
+	color: ${sourcePalette.neutral[60]};
+	padding: ${space[3]}px;
+	text-align: center;
+`;
+
+interface SearchResult {
+	id: string;
+	webTitle: string;
+	webUrl: string;
+	sectionName?: string;
+	pillarName?: string;
+	fields?: {
+		thumbnail?: string;
+		trailText?: string;
+	};
+}
+
+const pillarColors: Record<string, string> = {
+	News: sourcePalette.news[400],
+	Opinion: sourcePalette.opinion[400],
+	Sport: sourcePalette.sport[400],
+	Culture: sourcePalette.culture[400],
+	Lifestyle: sourcePalette.lifestyle[400],
+};
+
+interface CAPISearchResponse {
+	response?: {
+		results?: SearchResult[];
+	};
+}
+
 export const SearchBar = () => {
 	const searchId = 'gu-search';
+	const [query, setQuery] = useState('');
+	const [results, setResults] = useState<SearchResult[]>([]);
+	const [isLoading, setIsLoading] = useState(false);
+	const [showResults, setShowResults] = useState(false);
+	const debounceRef = useRef<ReturnType<typeof setTimeout> | null>(null);
+	const containerRef = useRef<HTMLFormElement>(null);
+
+	const searchCAPI = useCallback(async (searchQuery: string) => {
+		if (searchQuery.length < 2) {
+			setResults([]);
+			setShowResults(false);
+			return;
+		}
+
+		setIsLoading(true);
+		setShowResults(true);
+
+		try {
+			const response = await fetch(
+				`https://content.guardianapis.com/search?q=${encodeURIComponent(
+					searchQuery,
+				)}&show-fields=thumbnail,trailText&page-size=5&api-key=test`,
+			);
+			const data = (await response.json()) as CAPISearchResponse;
+
+			if (data.response?.results) {
+				setResults(data.response.results);
+			} else {
+				setResults([]);
+			}
+		} catch {
+			setResults([]);
+		} finally {
+			setIsLoading(false);
+		}
+	}, []);
+
+	const handleInputChange = useCallback(
+		(e: React.ChangeEvent<HTMLInputElement>) => {
+			const value = e.target.value;
+			setQuery(value);
+
+			// Debounce the search
+			if (debounceRef.current) {
+				clearTimeout(debounceRef.current);
+			}
+
+			debounceRef.current = setTimeout(() => {
+				void searchCAPI(value);
+			}, 300);
+		},
+		[searchCAPI],
+	);
+
+	// Close dropdown when clicking outside
+	useEffect(() => {
+		const handleClickOutside = (event: MouseEvent) => {
+			if (
+				containerRef.current &&
+				!containerRef.current.contains(event.target as Node)
+			) {
+				setShowResults(false);
+			}
+		};
+
+		document.addEventListener('mousedown', handleClickOutside);
+		return () => {
+			document.removeEventListener('mousedown', handleClickOutside);
+		};
+	}, []);
+
 	return (
-		<form css={searchBar} action="https://www.google.co.uk/search">
+		<form
+			ref={containerRef}
+			css={searchBar}
+			action="https://www.google.co.uk/search"
+		>
 			<TextInput
 				hideLabel={true}
 				label="Search input"
 				cssOverrides={searchInput}
-				name="q" // query param sent to google
+				name="q"
 				placeholder="Search the Guardian"
 				data-link-name={nestedOphanComponents('header', 'search')}
 				className="selectableMenuItem"
 				tabIndex={-1}
 				id={searchId}
+				value={query}
+				onChange={handleInputChange}
+				onFocus={() => {
+					if (results.length > 0) setShowResults(true);
+				}}
+				autoComplete="off"
 			/>
 
 			<Label hideLabel={true} text="google-search" htmlFor={searchId}>
@@ -134,6 +331,69 @@ export const SearchBar = () => {
 				name="as_sitesearch"
 				value="www.theguardian.com"
 			/>
+
+			{/* Live Search Results Dropdown */}
+			{showResults && (
+				<div css={searchResultsDropdown}>
+					{isLoading && <div css={loadingText}>Searching...</div>}
+					{!isLoading &&
+						results.length === 0 &&
+						query.length >= 2 && (
+							<div css={noResultsText}>
+								No results found. Press Enter to search with
+								Google.
+							</div>
+						)}
+					{!isLoading &&
+						results.map((result) => (
+							<a
+								key={result.id}
+								href={result.webUrl}
+								css={searchResultItem}
+								onClick={() => setShowResults(false)}
+								data-link-name={nestedOphanComponents(
+									'header',
+									'search',
+									'result',
+								)}
+							>
+								{result.fields?.thumbnail ? (
+									<img
+										src={result.fields.thumbnail}
+										alt=""
+										css={resultThumbnail}
+										loading="lazy"
+									/>
+								) : null}
+								<div css={resultContent}>
+									<h4 css={resultHeadline}>
+										{result.webTitle}
+									</h4>
+									<div css={resultMeta}>
+										{result.pillarName ? (
+											<span
+												css={resultPillar}
+												style={{
+													color:
+														pillarColors[
+															result.pillarName
+														] ??
+														sourcePalette
+															.neutral[60],
+												}}
+											>
+												{result.pillarName}
+											</span>
+										) : null}
+										{result.sectionName ? (
+											<span>{result.sectionName}</span>
+										) : null}
+									</div>
+								</div>
+							</a>
+						))}
+				</div>
+			)}
 		</form>
 	);
 };