As I'm sure everyone knows, the Heron geo information is still available, though not standover figures:
http://www.heronbicycles.com/geometry.html. The geometry for the Heron Randonneur--very few of them made, as you say, Mike--is not so different from the Touring or Road models in terms of rake. If this one were a 59 or 61 . . . !
Greg Parker has kindly shared with me that the Sportif has more of a lower-mid trail configuration, with standard diameter tubing, and a level TT.
Tom in Miami (temporarily in Colorado)