Looking at a couple of postings in response to Mike G's groundsheet query, I think it is really sad when people lay a plastic sheet under a breathable groundsheet, just to keep it clean. Don't they realise that it wrecks the pitch within 4 or 5 days? Can't they see that it is selfish to do this, and that the results can often be seen for the rest of the season? I accept that people with frame tents often can't avoid killing grass, but surely caravanners should take a more responsible and thoughtful line on this? We have even seen carpet in an awning, although the ultimate this year was on a seasonal pitch in Belgium - they had laminate flooring laid in the awning. I kid you not. We use a breathable sheet at Easter, but nothing in the summer. Why not give it a try? It's one less thing to carry, get out and put away.