8 6 7 ▁continues ▁in ▁use , ▁and ▁is ▁protected ▁as ▁a ▁grade ▁II ▁listed ▁building . ▁ ▁The ▁sp it ▁is ▁subject ▁to ▁coast al ▁er os ion ▁which ▁has ▁gradually ▁pushed ▁the ▁sp it ▁towards ▁the ▁shore , ▁a ▁process ▁which ▁has ▁e aten ▁away ▁at ▁the ▁rem n ants ▁of ▁the ▁ 1 8 5 2 ▁west ▁wing ▁battery ▁and ▁bar ra cks , ▁and ▁has ▁exposed ▁the ▁found ations ▁of ▁the ▁later ▁for tr ess ▁on ▁occasions . ▁This ▁er os ion ▁has ▁increased ▁significantly ▁since ▁the ▁ 1 9 4 0 s , ▁due ▁to ▁the ▁construction ▁of ▁gro y ne ▁bar riers ▁at ▁nearby ▁B ourn em outh ▁and ▁Christ ch urch ▁which ▁prevent ed ▁the ▁natural ▁renew ing ▁of ▁the ▁sp it ▁with ▁p eb bles ▁was hed ▁from ▁local ▁cl iffs . ▁E ros ion ▁caused ▁fresh ▁damage ▁to ▁the ▁eastern ▁end ▁of ▁the ▁castle ▁in ▁early ▁ 2 0 1 3 , ▁leading ▁to ▁renew ed ▁concerns . ▁Government ▁efforts ▁began ▁in ▁the ▁ 1 9 6 0 s ▁to ▁try ▁to ▁stabil ise ▁the ▁sp it ▁in ▁its ▁current ▁position , ▁both ▁to ▁protect ▁the ▁castle ▁and ▁neighbour ing ▁towns , ▁with ▁over ▁ ▁of ▁gra vel ▁being ▁laid ▁down ▁in ▁the ▁ 1 9 9 0 s , ▁and ▁is ▁continu ing ▁in ▁the ▁ 2 1 st ▁century . ▁The ▁sp it ▁and ▁the ▁ad jo ining ▁coast line ▁is ▁protected ▁as ▁an ▁S SS I . ▁ ▁Architecture ▁ ▁Central