The company appeared to have tested this in Germany before rolling it out to a wider audience that includes the UK.

There's no certainty this will prevent another antitrust case against Google. The competing directories are clearly visible, but they're ultimately dwarfed by Google's own info. Also, these may be a little too familiar. Yelp and others complained about Google's "rival links" proposal back in 2013, and the EU ultimately rejected the concept. This isn't terribly far off. Even so, it's notable that Google is trying to preempt European legal action rather than waiting for the next antitrust case to implement changes.