The "Open University" doesn't do engineering degrees as such but their BA course requires students to do at least one module in each faculty - Arts, Science, Humanities and so on and you can major in one faculty. It is therefore possible to get an OU degree majored in "Technology" but not engineering per se. Check out their website at
www.open.ac.uk for information.
Engineering degrees usually require "laboratory" work as well as book learning. This is the reason for the paucity of distance learning engineering degrees. The same applies to many other courses in pure science, also social sciences such as psychology. Most distance learning courses are in subjects that can be studied from books and library research.
Seems a pretty sensible approach really. How do you study science or engineering to a decent standard without conducting experiments using "state of the art" equipment? Although people working in engineering have access to hardware to play with, imagine the workload for the university in trying to supervise and assess what you do!
I know of one Australian chap who did an engineering degree by distance learning (Melbourne Institute of Technology I believe) but he still had to attend formal classes for the practical part of the course, amounting to about one third of the workload.
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Through difficulties to the cinema