Call-out zones represent the cost chargeable to the client due to travel expenses to the proposed worksite from the base location ie. Pitlochry, Perth and Kinross. The final fee includes toll fees, congestion charges and any ferries or flights required for work not on the mainland.
A large amount of the final fee charged represents the cost of fuel and 'wear and tear' on the vehicle used to attend the clients site.
The images attached below gives my current zone map:
Zone charge does NOT include time traveling, this will be applied additionally.