➀ The Innovate UK's £1.5 million MARCONI project demonstrates quantum key distribution (QKD) through high-fidelity, modular, and scalable receiver modules. ➁ The project introduces two new OEM QKD receivers with different technologies, ensuring a robust domestic supply chain for critical quantum networking technologies. ➂ The receivers will be showcased in entanglement-based discrete variable-QKD transmission across both metro and long-haul networks, highlighting the scalability and performance of the MARCONI receivers.