Thanks for the UCLH scale, scarymary! I have never seen that one, and I like it quite a lot. Thanks to you too, Suzanne - I have seen the Riker one, and I'm not crazy about it because it's designed for intubated patients (has "biting ET tube" as one of the descriptors). A lot of the scales are designed for critical care, not procedural sedation, but some translate better than others.
I'm going to bring the UCLH scale to work tomorrow and see what my co-workers think.