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Abloy UK are the UK’s leading experts in high quality security and door locking functionality.
Abloy UK is part of the ASSA ABLOY Group, the global leader in access solutions.


Achilles has been an audit partner to the UK rail industry since 2001 developing and implementing the high standards of audit the industry requires.


Acorel is specialized in real-time solutions for automatic people counting based on most accurate technologies for passenger flow analysis since 1989.


An expert in business excellence, Adastra Group helps organisations to stabilise their performance, develop transformative strategies, and optimise their people, processes, systems, and data.
With clients including Transport for London and Network Rail, the company takes a holistic approach to operational excellence.


ADComms delivers innovative technology solutions and services to owners and operators of mission critical infrastructure.


Advanced Power Services takes pride in delivering efficient, profession, and friendly services, while maintaining exception safety standards in challenging infrastructures.


AECOM is the world’s trusted infrastructure consulting firm, delivering professional services throughout the project lifecycle. On projects spanning transportation, buildings, water, new energy and the environment, our public and private-sector clients trust us to solve their most complex challenges.
Our teams are driven by a common purpose to deliver a better world through our unrivalled technical expertise and innovation, a culture of equity, diversity and inclusion, and a commitment to environmental, social and governance priorities.


AEGIS is an independent railway engineering company. Since our formation in 1997, we have built an industry-wide reputation for providing direct access to highly experienced professionals providing engineering expertise, innovative solutions, rapid responses, agile methods and value for money.