A wet weekend coming up

Am I looking forward to the coming weekend? Well, yes and no. It's a Backpackers Club weekend in the Peak District, on the same pitch for two nights. I'm determined to take the tarp, rather than a tent and the forecast is WET. With the Lands End to John O'Groats trip coming up (albeit not until May 2009), I'm keen to put the tarp through its paces. I have to know that it will withstand rough weather. The car will be nearby if it blows away.