Waiting for the sales to buy end of line tent carpet! until then, picnic blankets from Aldi(nice colour, turquoise and yellow tartan pattern) and multi-stripe rag rug.
Thought the coir carpet sounded a bit rough on bare feet and quite bulky.
Gina, we bought a heavy coir mat for our 5m Ultimate last year. It fills the front half of the tent, and we had the inner in the back half. It's a great rug, but it's also very thick and so very heavy and bulky when folded. Can just see it in this pic. It's really nice, and although it's coir it is actually very comfortable to walk and sit on. It now covers the floor in our hallway, and I just chuck a few of the rag rugs in now, just because they're lighter and the kids can carry them.
I use a three piece coir mat for mine. It cost a little more but it's more managable to pack. I use rag rugs on top of that; they're ideal as they pack so small and they're easy to wash. I bought mine here: http://stores.ebay.co.uk/Priya-Perfection. Great value at £12 a pop...although I just checked and that store is closed until the end of August. You definitely need rugs on top of the matting, or you will experience unnecessarily itchy arse issues if you sit on the coir...
I had the 3-piece matting made. It was a little more expensive than two halves, but I like it better, for packing. Rag rugs: check out my previous link. £12 each in an eBay shop if you can wait till late August. Most of them on eBay are £20+. DjNewton is spot on - they're great - you can chuck them in the washing machine.
I went into the bell tents at the belltent stand at Windsor this year and they had the coir matting in them. I took my shoes off before I went in them and found the flooring really uncomfortable.
Felt the same as standing barefoot on a coir doormat. All very prickly and not nice at all.
I have rugs and I'm looking for a carpet for my bell tent but think I will have to make one (and hide all my mistakes )