Groundsheet? I have yet to use one on the challenge although always do in the US. In Scotland, I haven't come across rock strewn or pinecone-laden pitches so don't feel the need for the extra protection. But I also don't use a tarp (using a double walled tent instead) and I bring my pack into my tent at night. That's why I love the challenge, everybody does their own thing and we all seem to get there in the end!

Poundland - small groundsheet with peggable corners...I only meant to use it for one trip but still going strong 3 years later...

Hi all,
My Duomid porch groundsheet is garden rubble bag. Very cheap, several to a roll, already a near perfect size (when opened out) and mine is a very fetching blue colour. Pity I couldn't buy a blue Duomid to match.

Thanks all for the suggestions - some great ideas. We've gone for cutting up a double emergency bag as suggested by Robin as it allowed us to have one piece that covered most of the tent footprint rather than two separate pieces for a similar weight as the Polycryo.

It's not an essential bit of kit for us as the inner base is robust but I guess it's our one luxury to create a bit more warmth and maximises the use of our porches. :)