The JMB has investigated and the problems with flooding by Greene House/ Lyly House/ Jonson House are not due to local blockages on the estate. The problem is caused by the volume of water inside the main sewer network going into Gt Dover St, the water will subside as the sewers clear.
To reassure people, all the electrical cupboards on the Lawson Estate have a safety wall built in to stop water damage. I hope this is of use without being to technical.