Congrats on launching! Will take another look when I'll be in London again.

If it's "only" you who submits these reviews, you could make it more personal by adding a paragraph of text with a non-objective description. Would also help to separate your USP compared to Happy Cow.

I know a vegan blogger who wrote posts about the places she visited in towns, and people like those. It's easier to compare/trust the reviews of a single person vs. the reviews on happy cow that are written by many different people.