I'm not sure if you can access this in the States but have a go. Programme 4 has a nice segment on primroses.
Here is a link that might be useful: Gardeners' World
Thanks so much for sharing that tantalizing link. Unfortunately, I can't access it. It looks like a wonderful series and maybe the BBC will make it available to us one of these days. There are few things more lovely than English gardens!
We can't access it in Canada as well. However we can still see past shows on youtube. My fav is Alys Fowler.
Here is a link that might be useful: link to some bbc gardening world shows
...and thanks ianna.