I wouldn't like to be too specific on exact dates when we were discussing the importation of WPL units and the actual date they got their certificate but I gather there were a lot of false starts despite the fact that the Germans who are known to be very meticulous about things like this had given their blessing and certified the WPL, it felt like protectionism on the part of the french. No leach field is required now as far as I know, we pulled out due to the non license able units for 2nd/holiday homes. But there were a couple of changes made internally to the WPL Diamond in order to get full certification. Not that it matters but a friend constructed as you did his own fosse and the price was just a little more due in part to an extra large area being required compared to WPL diamond unit at around £5000 then