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Hi Andrew are you looking at 3 additional screens (eg 3 display outputs)?
What connection are needing HDMI, DVI, VGA?
OK docking stations only have a maximum of two outputs but two connections, for example you could have 1 HDMI, 1 DVI and 1 VGA, but the DVI and VGA use the same processor and thus cant be used to provide different outputs.
Your best option is to buy a standard docking station, then buy an USB video adaptor to provide you a third video output. This will mean installing drivers on your laptop but it is very effective, and what I do. You can pick the USB devices for around £15 here, and leave that connected to your new dock, so when you doc it you get the two video out on the dock plus this additional output.
Please let me know if you need anything further.