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A warm welcome to the Forums @Dazza94. Blaze have a finely tuned algorithm for step counting. The algorithm is designed to look for intensity and motion patterns that are most indicative of people walking and running. If you are working at a desk, cooking, or doing other arm movements, the Blaze can pick up some extra steps if it thinks you're walking.
You can restart the tracker to avoid this and if you want to negate that extra information, you can manually log the activity "Driving" by doing the following from your Fitbit app:
1. Tap the "+" icon
2. Tap Track Exercise
3. Enter your information
4. Tap Log It
5. Sync
Let me know how it goes. 
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