This old photo of the Stowage also shows St Nicholas's Church just in view on the left and the Charnel House left/centre.
A Charnel House is a vault or building where human skeletal remains are stored. They are often built near churches for depositing bones that are unearthed while digging graves The term can also be used more generally as a description of a place filled with death and destruction. The Charnel House was also known as the Watch House or Mortuary and was built soon after the rebuilding of the main part of the church at the end of the 17th C. At that time, bodies would be laid there for safekeeping. The building was restored in 1958.