The Euro 4 is in a drop down menu in 'indication of the environmental category'.
The next box for co2 - only fill in the amount if it is recorded on your V5 otherwise leave blank. Any that I've had where the vehicle is registered as a motor caravan the co2 box is blank.
I've just checked and the reason it won't accept 1.0 is because it will only accept numbers - so the . is what is making it unacceptable.
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