I don't think that applying for retrospective planning permission in order to then be able to use the heli movements as a grounds for objecting is likely to succeed, either in terms of being granted planning permission or as a subsequent objection. (beware opening a can of worms that might result in scrutiny being applied to your use of the land as an "H" - once you've said it is, it may be difficult to say it's not).
As Shy says - you'll have to object on the normal grounds with everyone else.
OH