Looking at the centre of the back of the chart, position 1 is at the top, this is for the second vehicle you use.
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At the side of the little drawing of a clock write the time you started in the second vehicle.
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Where it says “No” write the registration of the second vehicle.
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Write the start odo reading and finish odo reading for the second vehicle.
When you’ve inserted the time you took over the vehicle and the reg number and the start kilometers put the chart in the second vehicle and continue with your job.
When you change vehicles again simply do the same in position 2 and then position 3, if you look at the image above you’ll see that each position is numbered at the side of the little clock drawing.
You can use this chart for 4 vehicles so hopefully you’ll be able to play your part in saving a few trees 
Apologies to xrayday for going off toppic