The U.K. recently dropped tariffs from half of it's sugar imports as part of its post brexit, more outward looking trading policy: http://reut.rs/3s7MBYZ
The countries that export sugar to the UK (including E.U. ones) use neonicotinoids, so I guess this emergency measure is to soften the blow to UK farmers, and give them some breathing space while they transition to other crops. It makes sense for the UK to import sugar rather than produce it locally since extracting sugar from beet is far less efficient than extracting it from cane.
