Zero!
For the last go-'round on tents you may wish to take a look at this thread:
http://www.thorncycles.co.uk/forums/index.php?topic=3942.0For what I use, go here:
http://www.thorncycles.co.uk/forums/index.php?topic=3942.msg17485#msg17485http://www.thorncycles.co.uk/forums/index.php?topic=3942.msg17505#msg17505http://www.thorncycles.co.uk/forums/index.php?topic=3942.msg17568#msg17568To sum up: It is an inexpensive and highly serviceable, reasonably lightweight one-person tent with a convenient side-entry and I can
just sit up in it. At USD$60 on sale, I bought three so have some spares as they age/die. It is not self-supporting (requires a minimum of three pegs, but panniers-as-deadmen will do instead). It has a bug-mesh inner that must be pitched first and a waterproof fly-cover for foul weather that provides a small but usable vestibule capable of holding all my bags. It is a "cold" tent which addresses condensation by passing a lot of air. Fine for three-season use.
Prior to that (and still, as part of my SOL/casual overnight touring kit), I used a three-layer, hooped Gore-Tex bivy-tent that provided room for me, 1 HB bag, and 1 front pannier, max. It used an end-entry that was tough in muddy conditions, but was very warm, adding +15°F above ambient outdoor temps which could be good or bad, depending. Nice when cold, like being a slice of bread in a toaster for hot weather. Great for my four-season use.
I think the Scarp 2 looks like a nice tent. Lots of room for taking your bags inside if you wish, and room to spend the odd layover day as well (I use my one-person tents only for sleeping and move on regardless of weather). There's pros and cons to any tent, as that first thread referenced above will show. Many people who plan to travel for some time tend to "size-up" by one-person in the ratings (i.e. single people using a 2-person tent) so they have more room on layovers and can easily store all their gear inside and/or change clothes inside more easily.
Hillebergs of several varieties seem to be heavily preferred by many for true expedition touring. They are incredibly sturdy and durable in the worst of weather and most if not all have the advantage of pitching in one go, so the inner compartment stays dry. They are also expensive. Those who have them almost universally feel they are well worth it.
Of course, tarps and hammocks are viable alternatives for many. Don't forget to check the Backpacking Light (BPL) forum for thoughts on tents as well:
http://www.backpackinglight.com/cgi-bin/backpackinglight/forums/index.htmlHope this helps!
Best,
Dan.