This air raid shelter was discovered after the demolition of Ellington Girl's School in Park Place in Ramsgate. The school was built in 1914, and it is possible that the shelter was used in both the First and Second World Wars. It is surprisingly well constructed for a school shelter, being hewn from chalk beneath the school playground and takes the form of two parallel tunnels, accessed from three entrances on the surface. Inside, the toilet recesses remain, with corrugated tin cubicles; along with remnants of wooden benches and some interesting examples of WW2 graffiti are present on the walls. It is likely that the tunnels will be filled in as the site is currently being redeveloped, but fortunately I was able to visit as part of a trip with KURG and Sub Brit.
Update: I believe these tunnels have now been filled in.
The first of the two parallel tunnels
Second main tunnel