It does seem unlikely in our heavily regulated planning system, that it would be possible to carry out any development on agricultural land without planning permission. However as this book will demon

According to UK Building reg’s you do not need a soak away if the land you are building on has been a drainage field in the past. On diiging into the land we have found oold drainage pipes from when the land as a farm, we are hoping this is what the defination is? Many [...]