Personal
Passport
You need your passport. Shock.
Make sure it has six months left to run otherwise you'll be turned back at a border.
Make sure you have some room for visa stamps to go into your book. Most immigration officers are pretty decent about squeezing their stamps into your book but some believe they require a fresh new page -- often after a couple of blank ones.
Passport Photos
Have a few. The last thing you want to be doing is having to trail back to a main city for some passport photos when you could have a little stack of them in your bag.
Don't forget that if you have an inject printer then you can rattle a few dozen off yourself on a sheet of glossy printer paper.
Follow the UK guidelines (PDF).
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