In 1969 Hatfield College of Technology became Hatfield Polytechnic, offering honours degree courses in engineering and technology. In 1970 an observatory was built on the Bayfordbury Campus. Wall Hall and Balls Park Teacher Training Colleges merged in 1976 to become Hertfordshire College of Higher Education. In the same year Hatfield Polytechnic took over Balls Park. By 1977 more than ten per cent of the 4000 came from more than forty different countries. The Students' Union Social Centre opened in 1977.
