Just for fun, suppose enough members of parliament were coerced into voting for a ban, not difficult since they all follow like sheep and vote as they are told.
How would it be enforced? Big team of forensic experts to prove that pixels had been altered with intent to create an 'airbrush' effect? How do you define airbrushing? How can you prove that pixels have been altered for this purpose and not, for instance, to bring about localised contrast.
Next step is a law to forbid any alterations whatsoever in fashion, advertising, public magazines and websites.
You would need to be compelled by law to keep an original image just as it is taken by the camera, difficult again, exif data can easily be changed. There would have to be another law that would prohibit the change of the exif data, this is now getting really ridiculous.
Another law to prohibit the use and possession of exif altering programs.
These politicians don't live in the real world and they won't stop using any excuses (sometimes well meaning) to remove liberties with the pretext of protecting our children, protecting motorists, protecting smokers, drinkers, protecting women, preventing discrimination, terrorism, protecting, preventing, protecting, preventing...until there is nothing left that you can do, you start to suffocate from over-regulation and you want to scream and you cease to be a human...
You suddenly realise you are no better than a caged animal.
What's worse, Vogue is covered in zits and flab and crooked noses and wrinkles and uneven lips and you think, wow, so that's what this Autumn sexy fashion is all about.
I'll buy it, it's so exciting!