Aircraft maintenance services. The requirement is for a 5 year contract providing Post Design Services (PDS) work for the Dakota aircraft (excluding engines) and publication support for the Lancaster aircraft. The core Dakota requirement is for a PDS contract providing a custodial service for master documentation and maintenance of documentation/drawings; provision of copies of master drawings, prints, specifications and attendance at the BBMF Dakota Systems and Strucral Integrity Working Group (SSIWG). The core Lancaster requirement is for provision of a custodial service for master documentation and maintenance of documentation/drawings: including a register of technical publication material held and the necessary information to maintain configuration control; and provision of copies of master drawings, prints, specifications as requested by the Authority. The requirement is in 2 lots; 1st lot comprising the Dakota work and the 2nd lot the Lancaster support work. Companies are invited to apply for either or both lots.