I followed the link you put up in a comment on lithium_doll's journal, just because it's Dr Who.

The hoovering annoyed, but otoh, I'd have had to wait for the DVD release otherwise; no TV at home.. You'd have also thought that the Dr would know what Harriet did at the end on the grounds he knew she'd build the new golden age (tm) and knew her background. Ah well; regeneration created amnesia? It's not like they haven't used that as a plot point for every Doctor yet.