The St Kilda World Heritage Site is owned and managed by the National Trust for Scotland (NTS). The Management Plan for the St Kilda WHS (World Heritage Site) includes a contingency plan for this type of emergency and NTS sent staff to the island to initiate a programme to find and eliminate any rats which may have escaped from the Spinningdale. They remained on the islands for three days but detected no trace of rats. I understand that remains the position as the MoD staff resident on St Kilda are maintaining a watch for evidence of rats. Scottish Natural Heritage (SNH) continues to monitor the situation closely.