Its better to campaign for extra facilities being built alongside new housing than campaign against the construction of them
We need more housing, other people deserve a place to live just as much as you or I and when we get on the ladder we don't have the right to pull it up after ourselves (to lets be honest further profit from a falsely inflated housing market), we don't when we buy a property have a right to stop anything being built within two square miles, that doesn't come with the deeds to your house.
Getting in bed with nimbys is the wrong way to go about this, far better to put pressure onto make the best of new developments than to just try and stop an inevitable progress. Oxfordshire has loads of room to build on and solve its (self made) housing crisis without wrecking the local environment.