Some debate about mileage for reps : check out http://www.sanoodi.com/newroute/draw/
I have not saved laps , but get the long one to be 496 metres and the short at 288 metres ( not as sure on the latter due to where the turn into the upward bit starts ).
Try yourself.
Nick.
They seem believable. I wrote them down as 500m and 300m in my log last night, just from the times taken.
Trevor