Formed by the merger in 2011 of two sightseeing businesses in London and Paris, this firm provides open-top bus tours in 23 cities across four continents. It added four new cities in the past year including Berlin, its first move into Germany. Last year it expanded into Dublin with the acquisition of Irish City Tours, boosting 2019 sales to £206.4m, with profits of £21.2m. The London-based group, which is led by chief executive Alex Payne, 51, was acquired by private equity firm Exponent in 2015 for an undisclosed sum.