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Thanks yes this is right, you often get called in late-stage to sort an EMC issue long after everythings been designed and fixed in place.

And  every company you  go to has a list of stories which they tell about  cranky ways in which they passed EMC testing....

eg the one about how they got the product through EMC by  unscrewing the earth terminal from the enclosure, and re-screwing it in an inch to the left......and voila...EMC pass!

And then there's  the engineer who designed  a lot of  the PSU's for British  military equipment, saying that adding ferrite beads , chokes and Y capacitors to pass EMC is done like "adding currents to a cake mix".