ATP International Group, an Anglo-Dutch holiday company, has acquired Brentwood-based marine fares specialist Instone International for an undisclosed sum.

ATP International specialises in providing executive travel services for management specialist sectors, such as the oil and gas industry. It has its head office in London and employs more than 900 people internationally. ATP was bought by the Manchester office of Barclays Private Equity in a £73 million buy-out in July 2008.

The company will now have combined worldwide revenues of more than €750 million (664.2 million) and a network of 20 branches. Instone made a profit of £104,000 on sales of £12.4 million in the year ending 31 December 2007.

Graham Ramsay, group chief executive of ATP, said: “It is highly significant that in these difficult financial times ATP’s investors have recognised the quality of our team and our proposition sufficiently to support our continued growth.”