poetryguy - can you honestly say that the discrepancies were only twice, and that it was to collect your glasses and medication? If you can say that, then i would imagine yu could appeal (depending on your work policies)
it seems much more likely are you taking the p!ss, they have suspended you and now you want it to be illegal? i' not saying thats whats happened, but it seems unlikely that they would suspend you for two innocent occasions. It seems more likely that it is much more than you are letting on, or that your home is a long way away and youve used their petrol, their vehicle and their time to go and pick up your bits