I've seen the 'could be a hazard to low flying aircraft' objection used here in Aus too; a fairly transparent NIMBY-inspired argument to my mind - no offence, T21, if you weren't coming from that particular place - but they are big, will be marked on charts / maps, and ain't that hard to spot, so bring 'em on, I say.
So lets cover the whole of Oz with them and you can export the power to the rest of the world. Just keep the ******* things out of the UK.