They're about everywhere now and things are going to get a lot worse!
If you can lock stuff away then best do so, out of sight. If can be secured to make life harder then do it.
Most are resourceful bastards but if you can make life a bit harder they'll move on. I'm a bit sad about it especially at work and i'll write down the reg of any suspicious looking vehicles. We had an iveco tipper drive by slow 3 up 3 times in 1/2 hour within days our van was nicked. I followed some on the way home at the weekend, crawling along 3 up in a transit tipper looking down every drive. They may only be after scrap but they'll be sizing up your stuff while they collect it.