I initially went to the UK for 1 year, and did the same - one checked bag, one carry on, and a backpack for my gadgets.
Other than two plug converters, I didn't bring most of the things listed here, and got on just fine.
But I do suggest a tube of Neosporin as was recommended earlier (it seems the options aren't as good in the UK), and a few months supply of any medications that you are on, just in the rare event that your pharmacy doesn't stock what you might need.
Whatever you bring/don't bring, I'm sure you're going to have a great time!