It will most likely be a multi of some sort. (multiple colouring) measure the height of you brick to see if it is metric (65mm) or one of the imperial sizes. Using the brick selector posted by woody you can then start to narrow down the search. Ideally find a local builders merchant with good brick stocks and go and have a look armed with the basic information of brick size and colouring. If you see what you think would be a good match buy a few bricks and take them home to compare.
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or if you are doing it yourself you can find suppliers local to you.
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