At last a sensible answer!

And another thing - (Warning - thread drift) My Golf is all nicely polished - I had it out yesterday for a pair of front tyres ready for the trip.
Tonight when I got in, the Shitehawks have landed three direct hits. Luckily two were on glass, but there was a big one on the bonnet. It hadn't even gone hard, but had etched the lacquer quite deep.
It took a bit of effort to get rid of most of the damage. It's still just visible as what looks like sub surface pitting, but remember I'm a perfectionist, so from a couple of inches away you can't see it. Nonetheless I've issued some bird shite removal instructions in advance of the trip. Bound to be some French Shitehaws in play.