The West Window was given in memory of Betsy Mashiter who died in 1860.
The central pane shows Henry II presenting a charter to a monk of the Abbey of Monjoux (now in south-east France), granting land in Havering.
The left pane shows the arms of New Zealand, commemorating that they stayed in Grey Towers. In 1916, four young Maori soldiers were buried in the church graveyard.
The right pane shows the arms of Trinity House. The spire acted as a navigational aid for Thames boat pilots and Trinity House helped contributed to its upkeep.