dogie, can you confirm that these things will use a C13 plug instead of the high temp (kettle plug) C15 version?
They're the same thing, apart from one has a higher temp rating.
No, not quite. If the PSU had a C16 on it, you couldn't fit a C13 cable into it and would need a C15 cable. I couldn't imagine them using a C16 instead of C14, but generally when people talk about a kettle plug they're talking about the high temp version.