Want to find out more? We're busy working to save the planet but send us a message and one of our specialists will get back to you as soon as possible. Our locations London Protostar Group Limited, 100 Cannon Street, London, EC4N 6EV. United Kingdom. Oman Carbon Management Services SPC, P.O. Box: 117, PC: 116, Muscat, Sultanate of Oman. United Arab Emirates 44.01, Office 106, Arjumund building DIP 1, United Arab Emirates.