Pipits and call on video clip, East London. (1 Viewer)

Out with my girlfriend and her mother at a rainy Fairlop Country Park last Sunday, I snapped these three birds in the top of this tree. My thoughts were Meadow Pipits, but I'd like confirmation if possible please.

Then my girlfriend heard the alarming call in the clip she put up on YouTube as she walked back from work somewhere around Harlow, I think. She was unable to locate the bird that was making the call, but she wondered if it might be an owl.

Thanks in advance to anybody who can help.

http://www.youtube.com/watch?v=hdDmTL9FSME

yep both correct........meadow pipits and tawny owl

The call is actually the alarm call of a Sparrowhawk...
See http://www.xeno-canto.org/107357

Yes. These are Eurasian Sparrowhawk calls.

http://www.xeno-canto.org/browse.php?query=Eurasian+Sparrowhawk+%28Accipiter+nisus%29+21&species_nr=vicptq