Help identifying wild flower ?

[mikegroves2013]

Please help, Unidentified wild flower covering a whole field (some 3 acres) which is now ruined (should have been for hay).

LOCATION: Rhuallt, North Wales, LL17 0TH


pictures here:

Flickr: mikegroves2013's Photostream


THANK YOU VERY MUCH IN ADVANCE FOR ANY HELP

[veggiechicken]

Croeso Mike
Is it Yellow Rattle? Rhinanthus minor

[shepp726]

could be hemp nettle

[Nicos]

If it is then...
quote.... "! But you can get rid of it easily: just cut the flowers before they can produce seed, and the yellow rattle will disappear from your meadow"

...it says here it's toxic to animals so you intend to use the grass next year as hay then you need to cut it asap to get rid of it!
Have a look espesh at the uses on this iste...

Plants & Fungi: Rhinanthus minor (yellow rattle) - Species profile from Kew