Ah yes, it's all coming back to me now. And I think that RAI1-3 are scrambled less often than they used to be.
But what really confused me is that I just discovered that on my DM, RAI4 had got magically re-named "removed service" (even though it was still there) and RAI1-3 names had been replaced by their frequency/SID. Weird.
Anyway, I'm sorted now. Thanks for the replies.