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| So if my brother was to fly from London to his Brussels office for a week he would be breaking the law (without a visa)? | |
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https://www.gov.uk/visit-europe-1-ja...a-requirements
Depends on individual countries and your work situation. I read somewhere that Malta among others will require a visa even for short business travel.
Edit:
https://twitter.com/simoncalder/stat...184031233?s=21
“This has consequences for UK business visitors to some countries. The general principle of 90 days’ travel in any 180 is overridden in Cyprus, Denmark, Hungary and Malta. According to p751, they will need a work permit "in case the short-term business visitor supplies a service”.