For accuracy sake, the banana curveness ratings were a lie created by Rupert Murdoch's tabloids.

This was flamboyantly repeated and amplified by the current UK Prime Minister who was then 'journalist' Boris Johnson.

There is quite literally an archive in the European Comission containing, clarifications regarding lies and misrepresentation of facts (the large majority of which created by UK newspapers).

https://blogs.ec.europa.eu/ECintheUK/curved-bananas/