Brexit will impact competition (or antitrust) law in the UK. There will likely be material changes in procedural law in particular. Changes to substantive law will probably be less significant, at least for most companies, but there are still issues which companies need to consider. These procedural and substantive changes will not be immediate (and there will likely be transitional provisions dealing with Brexit itself and the UK’s new trading arrangements with the EU), but there are steps which we recommend companies take now in relation to competition law.