The homeworking firm was named on the list at the weekend for the sixth year in succession, moving up from 85th in 2019 to 48th – the first time it has broken into the Top 50.
It was recognised for its "positive response" to the challenges posed by coronavirus, and for supporting its travel counsellors through a digital information hub and expanded welfare fund.
Chief executive Steve Byrne said the company’s movement up the table was testament to its "unwavering focus" on caring for its customers, business owners, colleagues and communities.
"The value of a human, trusted, travel expert who can be there for their customers has been proven time and time again during the course of this crisis," said Byrne.
"This listing is thanks to the care our people have shown to customers, and each other, over the past few months, and demonstrates how working smarter, remotely, and wherever its secure to do so, supported by a technology platform and a community of nearly 2,000 people that are routing for each other to be successful, can form the backbone to growth."
The table ranks Britain’s private mid-market firms by sales, with companies required to demonstrate a minimum of 5% growth in sales or profits year-on-year.
Other travel and tourism firms making the list include Travelodge (three), Parkdean Resort (34), Leisure Pass Group (50), Click Travel (65), Hays Travel (73), Euromonitor (164), ACC Aviation (181) and Titan Airways (228).
