Thank you very much, . I’m just starting out in UE4 (my first go in any engine actually, and my first post on here), and your post was very useful indeed.
As kraid mentions, it does appear that the order of the tags in C4D matters. The material tags have to be on the left or a) you get a load of errors on import and b) UE4 doesn’t recognise any of the elements (i.e. dsenter’s problem). I now make a habit of arranging them thus: material, selection, phong, UV.
Thanks again!