Some more useful links

Regions

• Flemish Region:
  • site of the Flemish departement of Foreign Affairs
  • site of Flanders Investment and Trade (nl)
• Federation Wallonia-Brussels: site of Wallonie-Bruxelles International (research and education) (fr)
• Walloon Region: 
  • site of Wallonia (fr)
  • site of the Walloon Agency for Export (fr)

Other

• European Commission's Brexit page
• European Council's Brexit page
• Belgian Embassy in London
• British Embassy in Brussels
• Department for Exiting the European Union (DExEU) (British Government department)
• Foreign & Commonwealth Office: Living in Belgium (British Government department)
• Factsheets: https://ec.europa.eu/info/publications/factsheets-and-questions-and-answers_en