Property Lease Renewal

The information contained within this announcement is deemed by the Company to constitute inside information as stipulated under the UK version of the EU Market Abuse Regulation (2014/596) which is part of UK law by virtue of the European Union (Withdrawal) Act 2018, ("MAR"), and is disclosed in accordance with the Company's obligations under Article 17 of MAR. Upon the publication of this announcement via a Regulatory Information Service, this inside information will be considered to be in the public domain.

6 May 2026

Chesterfield Special Cylinders Holdings plc

(the "Company")

Property Lease Renewal

Chesterfield Special Cylinders Holdings plc (AIM: CSC) is pleased to announce that it has successfully renewed the lease on three acres of land adjacent to its existing freehold site in Sheffield, with effect from today, resulting in a material change to the value of property assets on the Company's balance sheet.

At the end of September 2025, the remaining leasehold term was less than twenty years and the net book value of the Company's land and building assets was £2.6 million.

The new 125-year lease provides long-term security for the Company's manufacturing operations and results in a revised valuation of the Company's land and building assets of £4.9 million. Details of the new lease and the revised asset valuation will be included as a post balance sheet event in the Company's FY26 interim results statement.

Additional information:

The person responsible for arranging release of this announcement on behalf of the Company is Chris Walters, Chief Executive.

For further information, please contact:

COMPANY DESCRIPTION

www.csc-holdings.com and www.chesterfieldcylinders.com

Chesterfield Special Cylinders is a world-leading designer and manufacturer of high-pressure gas storage and transportation systems, used principally in safety-critical defence and hydrogen energy applications, and provides inspection, testing and recertification services throughout the system lifecycle.