 At Cambridge he met his wife Ruth Felton at meetings of The Round Country Dance society.After commencing research in theoretical physics he switched his attention to Numerical Analysis and Programming, spurred on by his close contact with the construction of the EDSAC prototype computer in the Mathematical Laboratory, under Maurice Wilkes.In 1951 Felton joined Elliott Brothers in Borehamwood where he designed the programming systems and wrote software for the Nicholas and Elliott 402 computers.