Ask Rhod Gilbert
1x08 Episode 8 [season finale]
The Sarah Jane Adventures
4x11 Goodbye, Sarah Jane Smith Part One
4x12 Goodbye, Sarah Jane Smith Part Two [season finale]
Nice finale to a good season, well done all. Had sneakily hoped for a trailer for the next series, as they've already filmed half of it, but no such luck. Ah well.
[Watch parts one and two, or a compilation of both, on iPlayer.]