Plymouth is one of the UK’s most sheltered harbours and has been used by the Navy for 100s of years. Like in Portsmouth the Navy has control of the harbour and they do more local manoeuvres
than in the Solent. They do provide small-ships channels for us smaller boats to shelter in. Plymouth has lots of shore based things to do https://www.visitplymouth.co.uk/ and there will be no excuse to be bored if you are storm-bound there. There are lots of historic sites, an ancient gin distillery and a new aquarium to visit. There is a choice of marinas to do the handover and it is decided by simply the choice of the adjacent skippers. Plymouth Yacht Haven is on the opposite peninsular to the main city and is a tedious extra distance to drive, a long taxi fare from the station or best the small foot passenger ferry across the water https://www.mountbattenferry.co.uk/ . Queen Anne’s Battery and the Mayflower marinas are equally as close to the city centre and the station, but the Mayflower has the considerable advantage of its own secure car park (but £5 a day when the boat is not there). This site gives access to a harbour guide, https://www.harbourguides.com/harbours/Plymouth/pilot-notes . Plymouth sound is sheltered from the west and has some very quiet anchorages such as Cawsand.