R&M Clarkson was formed in 1974, building a loyal team of dedicated system designers and specialist engineers, developing its ... core business operations whilst maintaining its ultra-high quality standards. In the summer of 2013 the Company became part of the DEF Group, a French fire alarm system manufacturer and service provider. Clarkson design, supply, install, commission and provide ongoing maintenance we also have GWO certified engineers to install and maintain systems offshore. read more