Is chocolate made in the U.K. actually for sale in the U.K. or is it for export only? as most chocolate seems to be Slovakia or eastern E.U.?

Or in other words, Does chocolate made in the U.K. get exported abroad only and the stuff we get in the U.K. get exclusively made in eastern Europe all to avoid tax? If so, do we in the U.K. export British milk powders etc to these other countries or is the milk powders in E.U. chocolate Slovakian/ Polish etc?
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