Suggestions for good UFO/Alien DVD's?

Just looking for some for good UFO/Alien type TV documentary/investigations etc, (either DVD's or Bluray) ? I'd like something good which I can give to my mum for Xmas. She loves this topic... I don't want to get her any poor stuff.

Any suggestions?
Thanks very much Reece, that's the last place I would have looked...

'Westall 1966' looks good so far... If I can get actually find a copy.