As a long-time fan, I was delighted to see that bakery firm Greggs had recently hit £1bn in revenue. As a brand with ballsy comms, solid stunts and tasty baked goods, the recognition is well-earned. Now, over the course of our years in PR, we’ve come across many a high-growth firm and even represented our first travel service unicorn, Klook, last year.

At the same time, many of our firms are born and bred in the grass roots. Workplace advice platform Rungway is a...