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Cover - USD ($) $ in Millions	12 Months Ended
Cover - USD ($) $ in Millions	Dec. 31, 2024	Mar. 14, 2025	Jun. 30, 2024
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-40367
Entity Registrant Name	BARINTHUS BIOTHERAPEUTICS PLC
Entity Incorporation, State or Country Code	X0
Entity Address, Address Line One	Unit 6-10, Zeus Building
Entity Address, Address Line Two	Rutherford Avenue
Entity Address, City or Town	Harwell, Didcot
Entity Address, Country	GB
Entity Address, Postal Zip Code	OX11 0DF
City Area Code	+44 (0)
Local Phone Number	1865 818 808
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 31.1
Entity Common Stock, Shares Outstanding		40,339,395
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement to be filed with the Securities and Exchange Commission relative to the registrant’s 2025 Annual Meeting of Shareholders are incorporated by reference into Items 10, 11, 12, 13 and 14 of Part III of this Annual Report on Form 10-K.
Entity Central Index Key	0001828185
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Tax Identification Number	00-0000000
American Depositary Shares
Document Information [Line Items]
Title of 12(b) Security	American Depositary Shares
Trading Symbol	BRNS
Security Exchange Name	NASDAQ
Ordinary shares
Document Information [Line Items]
Title of 12(b) Security	Ordinary shares, nominal value £0.000025 per share