OK, some more research....
I'm now convinced that the Ozark I have is the 1987 model. It's the Red and Black model with U-Brake (pics below)
I believe (and I'm sure someone will be along shortly to correct me if I'm wrong
) that the '87 Ozark was red/black, the '88 Ozark was red/white and the '89 Ozark was white and purple.
Seems as though there were US/Canadian variants of the Ozark, as I've seen a couple of completely white ones with U-Brake on the Web on the other side of the pond.
Bikes: '92 Alpinestars AL Mega DX, '93 Cannondale M2000, '94 GT Zaskar, '90 Saracen Tufftrax (Pink!), '9? Raleigh RSP Team Edition 853
Projects: '89 Muddy Fox Courier Comp , '93 Raleigh Apex, '92 Cannondale M2000, '91 Scott Boulder, '87 Raleigh Ozark, '89 Raleigh Avanti, '87/88(?) Marin Palisades Trail, '91/92 Saracen Conquest E Stay, Unknown Saracen (1994?) Frame...