trickydisco, my kit list was something like this:
Living:
Tent, I got this (http://www.livefortheoutdoors.com/Gear-Reviews/Search-Results/Tents/Wild-Country-Aspect-2-2010/) which was ace. Not the lightest, I could have shed a kilo here, but it had enough room to cook and would have been fine for 2 people.
3/4 length therma rest
1-2 season sleeping bag
Cotton bag liner
Soap (detol, the bunisness) for cleaning everything, including clothes)
Toothbrush
Toothpaste
Tiny travel towel
Head torch
Opinel
Clothes off the bike:
Flipflops
Board shorts
1 Tshirt
Wooly hat
Clothes on the bike:
Cycling shorts 1
Longsleeve 200 weight icebreaker with collar and zip. Good in all conditions and keeps the sun off.
Mavic cycling Jacket
Cheap Aussie cotton brimmed hat. Sunnies.
Buff
Cycling shoes
Gloves
Short socks 2 pairs (the luxury!)
Tools/Spares:
Spokes, front/rear
Spoke key
Park multitool
Small pair of pliers
8mm allenkey bought route (useless square taper!)
Wheel spanner
Everything was chossen to be of use on and off the bike. The Aussie hat kept the sun off, rain off and you can soak it to keep cool. I don't like suncream or sunburn so I keep covered up. The long sleve icebreaker kept the sun off my arms and neck, could be undone to cool off or done right up to keep warm and didn't need (too much!) washing!
If I got cold, the merino went on, the T shirt went on, the jacket went on as did the hat and buff. I was still in shorts and flipflops mind but my legs are tough from years on the bike!
To be fair I was in europe in the summer, but we did get a few cold days and a few days of rain. Going further afield you'd need more, but probably only shoes, trousers and fleece.
Started with a stove, but that soon went back. You can generally find food anywhere, just keep some spares incase you run short. You can go a long way on nuts and chocolate though!
Thats the minimum I think you can get away with without being a cycling tramp. Proably 10 - 15kg max. I got all that in 2 small rear panniers and a bar bag, nothing on the rack apart from the odd bottle of wine or BBQ!
Anyway, ramble over. You go away to get away from it all, so leave all the clutter at home and free yourself!