You're spoilt for choice, really.
A couple of liners are easily accessable from Eastbourne. The Gascony and Shirala from Selsey or Portsmouth. Also HMS Northcoates, HMS Sapper in that area. Teapot (aka Brigitta). HMS Leopold is fantastic. City of Waterford from Brighton. The list goes on. The Mullberries are a stunning dive in 10m of water. The Valentine tanks from Poole are good and shallow (<15m?) The Betsy Anna from Swanage. I'll stop there, I think you get the idea.
Pick up copies of the Dive x (where x is Sussex, Dorset, Hampshire and Wight, Kent) and plan away
dan