Sorry I didn't get these measurements to you yesterday Chris, but I have managed to get round to it today. Brace yourself though, because you're going to see a picture of my van when it's dirty! I'm ashamed to be honest.
Top pic is fully up, wheel arch to wheel centre at the front is 390mm, so approx. 85mm lower than a standard van. The bottom edge of the front splitter is 163mm from the ground.
Then, and I know you didn't ask for this, but I just can't help myself, there's a pic of it aired out. It's 260mm at the back, 280mm at the front. I would need to get the grinder and welder out to get the front any lower, but I just don't have the time, plus I quite like the more level stance when it's aired out with a bit more tuck at the rear than the front.
Hope that helps fella.
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