Airspace change proposals don't normally involve the grabbing of any land so the thread title is misleading.
BAA are planning to knock down the Loganair hangar and build more apron space with some new hangarage going up on land they own but not currently used for airfield operations .... which is what I thought the topic might be about.
The airspace proposal (if it even exists) will be conducted as a consultation exercise with public input possible. There you will have the possibility to explain why you don't agree with the proposed changes (assuming you read them), from an educated standpoint. If you can give a logical argument to back up any objections, then the CAA will listen to you and the authority making the proposal will have a duty to resolve it with you. If you simply say 'I don't like it', then the CAA will give your objection as much thought as that response takes on your part.
As suggested, check the CAA Directorate of Airspace Policy website. There you will find the procedure for 'Airspace Changes' and notification of any which are in process.