Leydene House / HMS Mercury

HMS Mercury was a shore establishment of the Royal Navy, and the site of the Royal Navy Signals School and Combined Signals School. There was also a subsidiary branch, HMS Mercury II.

The school was established at Leydene House, East Meon, near Petersfield, Hampshire, England and was commissioned as HMS Mercury on 16 August 1941 under the command of Captain Gerald Warner. A signalling school had been established at HM Barracks, Portsmouth in 1904 and was transferred to Petersfield during the Second World War.