HMS Mersey is a River-class offshore patrol vessel of the British Royal Navy. Named after the River Mersey, she is the fifth RN vessel to carry the name and the first to be named Mersey in 84 years. From Wikipedia
HMS St Albans and HMS Mersey, supported by a Merlin helicopter and RFA Tidesurge, monitored Russian vessels Admiral Golovoko and Soobrazitelny in a high-readiness operation.
