The purpose of this Planned Procurement notice is to notify the market of a future- tender for the Maintenance and Replacement of Compressors and Driers across the London Underground Estate. The proposed service will be delivered through a single-supplier model under a consolidated contract, providing a consistent and integrated approach to the management of these safety-critical assets. The future contract will provide maintenance and statutory compliance services for compressed air systems and pressure vessel assets across London Underground, excluding Power Assets. The services will support compressed air and pressure vessel assets associated with: • Rolling Stock maintenance facilities • Signalling infrastructure • Fire safety systems • Depot tooling and workshop equipment • Manufacturing facilities • Station smoke extraction systems • Effluent ejectors • Train cleaning systems The scope includes: • Planned Maintenance: Scheduled inspections, servicing, and performance checks to maintain asset reliability, availability, and statutory compliance. • Fault Response: Reactive support and emergency attendance in response to equipment failures, alarms, and operational incidents. • Fault Rectification: Diagnosis and repair of faults, including component replacement, system reinstatement, and verification testing. • Critical Spares Management: Supply and management of essential spare parts required to maintain asset availability and support rapid fault recovery. • Statutory Examinations: Delivery of inspections, Written Schemes of Examination, and certification activities required under the Pressure Systems Safety Regulations (PSSR).