ridgeback voyager frame sizing

ram038

Anyone know where I can get the frame geometry spec for the Ridgeback Voyager? I am going to buy one through the C2W scheme at work (Halfords) so cannot go to a shop and test ride one to determine frame size needed. I cannot find any info on the Ridgeback website. i did email them my inseam length and height and they pointed me towards a 54cm which is 2cm larger than my road bike frame size, would that be about right for a tourer compared to a road bike ?