Archaeological monitoring and recording was undertaken by Colchester Archaeological Trust in May 2019 during auguring within the crypt (located in the NE corner of the Church) to determine the extent of potential oil contamination caused by a leak from the feed line to the boiler. Twenty-four holes were augered in the floor of the crypt, to a depth of 0.5-1m. Four layers were recorded. A concrete floor (L1, c 0.15m thick) overlay a sandy-silt (L2, c.0.35m thick, soft, moist medium/dark grey/brown sandy-silt with brick and mortar flecks). Beneath L2 lay a sandy-silty-clay (L3, c.0.25m thick, soft, moist light/medium grey/brown sandy-silty-clay with charcoal, oyster, brick and mortar flecks), which in turn sealed a silty-clay (L4, soft, moist medium/dark grey/brown silty-clay with charcoal, oyster, daub and mortar flecks).<1>