The company analyzed almost 250,000 hotel reviews on the site, comparing the profile of five-star reviewers with those who left only three stars. While it’s been suggested in the past that fake reviews are most common on small B&Bs and guesthouses, the company looked at the highest-profile hotels in their respective regions.

The 15 that looked most blatantly suspicious included some of the best-rated hotels in the Middle East, four of the best-rated hotels in Las Vegas, and one of the hotels in Britain’s second-biggest hotel chain, Travelodge. When Which? reported them to TripAdvisor, it admitted that 14 of them – 93% – had been caught with dodgy reviews in the past year.

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