In reply to airbournegrapefruit: I've got my ML and I've used it alot. Since buying a contoured memory-foam pillow a few years ago I now take it everywhere, including overnight expeds. Suprisingly, it packs down really small and makes a MASSIVE difference to my quality of sleep. You can get them for about £20 or so from Asda now. Takes one or two nights to adjust to it, but once you do, you'll never go back to normal pillows.
I also swear by foam earplugs. Makes a big difference too. I always take them whenever I'm camping.
Don't need a bivi bag so long as you keep your sleeping bag in a drybag. And so long as your bag is 3-season.
Don't need belay gloves.
I'd recommend a fresh pair of socks for each day you're on your exped, in case they get really wet. Plus, it's just good for morale - can't beat the feeling of putting on fresh dry socks in the morning! Keep these in a dry-bag too.
All of your clothes should be synthetic (except maybe you've got a merino wool top or wool socks). For trousers, I'd recommend really thin polyester trousers. Light, summer-type ones.
I often have a thing about being able to make a properly good cup of tea, so I have a tiny little tupperware tub for some sugar, another for some teabags and even a tupperware 'beaker' with fresh milk in! Unless you're especially fit though, I wouldn't bother with this extra weight.
Another personal preference I have is to have a small book to read as I go to sleep, but that's just me.
I wouldn't bother with an ipod. You always think you're going to use it but you never do.