National Grid Electricity Transmission Plc is seeking experienced and suitably qualified suppliers capable of delivering a fully integrated security solution for critical national infrastructure sites at Walham and Pentir. The requirement is divided into two separate Lots: Lot 1 (Walham) and Lot 2 (Pentir). Suppliers may submit tenders for one or both Lots; however, no supplier will be awarded more than one Lot. Further details in relation to the scope are set out in the Instructions to Tenderers. – Lot nr.: 1 Lot 1. ISS Walham, Gloucestershire National Grid Electricity Transmission Plc is seeking an experienced and suitably qualified supplier capable of delivering a fully integrated security solution for a critical national infrastructure site at Walham. Duration contract start date : 16/05/2027 11:00:00 PM Duration contract end date : 14/01/2028 11:59:59 PM Criteria definitions: Quality: 75 (Technical) Cost: 25 (Commercial) – Lot nr.: 2 Lot 2. ISS Pentir, Gwynedd National Grid Electricity Transmission Plc is seeking an experienced and suitably qualified supplier capable of delivering a fully integrated security solution for a critical national infrastructure site at Pentir. Duration contract start date : 16/05/2027 11:00:00 PM Duration contract end date : 14/01/2028 11:59:59 PM Criteria definitions: Quality: 75 (Technical) Cost: 25 (Commercial)