British Standard BS AU 145d
The current standard on number plate construction: BS AU 145d has been effective since 2001.
BS AU 145d was brought in because number plate design and quality was considered uncontrolled.
It was a big change from the previous standard, BS AU 145a.
Some of the key changes related to 'd' included:
- increasing the weathering test from 1,200 hours to 2,275 hours. PET, which was previously suitable for UK number plates under BS AU 145a, no longer passed the British Standard.
- introduction of the impact and bend tests
- reduced advertising space
- borders reduced to a defined size.
BS AU 145d is still effective today, with the new BS AU 145e standard expected to become effective in 2019.