Miles is senior lecturer in ICT at Roehampton University. He teaches initial teacher training courses as part of the undergraduate and postgraduate programmes, as well as tutoring students on school placements and masters students. His principal research focus is the role of online communities in the professional formation and development of teachers. Other professional interests include knowledge management in education, use of open source software and principles in schools, provision for the gifted and talented and independent learning. He is the community manager of Open Source Schools.

Miles is a chartered fellow of the British Computer Society, and a member of its Education and Training Expert Panel and e-learning specialist group. He is also a fellow of the RSA, Mirandanet and Naace, serving on the latter's board of management. He is a member of the Institute of Mathematics and its Applications and an Apple Distinguished Educator.

Until recently, he was head of Alton Convent Prep. In his former post as deputy head of St Ives School, Haslemere, he pioneered the use of Moodle and Elgg in primary education. His work on implementing Moodle was documented as the dissertation for Leicester University's MBA in Educational Management, and won the 2006 Becta ICT in Practice Award for primary teaching. Other interests include classical music, creative cookery and photography.