In the US they sell brown rice that comes packaged in plastic bags with little holes in them (about 2 servings per bag) and you just throw the thing in boiling water for 8-10 minutes, let it drain, cut it open and eat it. (You can cook it in the microwave, too, and it's probably even quicker.) The brand is Success, it comes with 4 bags in a box. I'm sure they would sell something like that in the UK.
If you're looking at the quick/easy stuff, make sure you read the labels (you probably know that...) because some of the instant rices have all that other crap added to them.