Most business's don't export. But those that do, I think more export to Europe than outside of it.
In 2020 our exports to the eu were £251 billion, 42% of all exports, down from 54% in 2006. Exports to the EU are falling whilst exports to non eu countries are rising.
You may well be right that in terms of 'number of companies' more export to the EU than the rest of the world (although lower values), but you're saying you are privvy to information that the ONS don't have, that's quite a claim.
