Image is wrong. Turkey is not in the EU Customs Union, which is only available to EU members. This "mistake" is often promoted within Brexiteer circles, but it is easy to dispel.

There is a Customs Union between Turkey and the EU, which is something entirely different. An agreement or treaty must be in force by the 29th of March of 2019 to avoid custom checks at UK-EU borders, for that is the the default outcome of leaving the EU.

luis_de_sousa@mastodon.social