Sorry for my continual ob-cessing about the septic tank. They arrived today with two tankers – each decorated with the slogan above – and carried out an evacuation of all four Bogstead systems. If you really want to get ‘into this’ as it were, here are the pretty diagrams for a CAP [Continuous Aeration Plant]. You have to empty the outer chamber first – if you do it the other way round, the pressure in the outer chamber distorts the inner chamber and damages it. That’s what we think has happened to at least two of the four systems here. Isn’t it wonderful that this time last week I knew nothing at all about all this?