@cotty said:
You should not explode the object before the intersection.
I tried it before exploding and after exploding (basically every possible combination of grouping, one item grouped, all exploded etc)
The thing is though, you can see the outline part way up the 3D shape where the intersect must have occurred, but the face/plane remains unaffected.
I'm in a mega rush with this job as I've been given it at extremely short notice, so I've botched a fix by manually tracing round the 3D shape, which has worked.
Dave R, I'm afraid I've saved the botched version now so I don't have the faulty one to upload to satisfy your curiosity thanks for the offer though.