The Ministry of Defence has gone to the market for a portable air raid warning siren system to supplement the existing sirens at RAF Akrotiri in Cyprus, in a tender worth an estimated £800,000 over five years, the department has said. According to the tender notice, published on 11 June, there is a need to supplement the air raid warning sirens currently in place at the base, with the requirement being for sirens able to cover the distance of bo…