RSM Agency | 1,250 followers on LinkedIn. For nearly three decades we have successfully supported companies with marketing and business consultancy. | RSM is a Milton Keynes-based marketing communications agency that quite simply delivers on its promises. We like to be different! With an unwavering focus on the end goal, whether that is to increase sales, be more well-known or improve team performance, at RSM we always follow our Research: Concept: Deliver process.