I would like to see better pics, as it is extremely difficult to see any sort of fine detail here. I'm not even sure what age or sex this bird is: I'm getting an impression that it may be a 2nd cal bird, with the underwing coverts appearing warm-toned, but this is just an educated guess, really. There don't appear to be any barred axilliaries, which would be diagnostic of Montagu's, but, then, perhaps these have yet to be moulted if it is a 2cy bird? Still, I would tend to provisionally agree with Mattias insomuch as that the inner primaries do appear to lack an obvious dark trailing edge, which would be a pro-Pallid character, but would stop short of claiming it as a certain Pallid on the available evidence. If it is one, the slight build would almost suggest 2cy male rather than a female?
Regards,
Harry