With our planning permission we had to prove we were unable to connect to a main sewer before they would consider a treatment plan.

Jeremy installed his own treatment plant simply because the cost of connecting to the main sewer was too much and his planners accepted it.

 

(ditto his borehole for water)
 

Hav nt seen in the exact breakdown but I m told it's the cost of shuttering down 4m deep on a relatively major road. Fortunately it seems we can connect to the sewer at the side of the plot, provided we get agreement from local parish (who own the land), and technical sign off from Welsh water.