If someone has an idea for a business and registers the name as a co.uk and then someone who has the same name as a .com decides to trade in something unsavoury can the owner of the .co.uk addy do anything to stop it?

or is the easyest way with the cost of web name extentions just to buy both the .co.uk and .com if avaliable and direct the .com addy to the .co.uk website.

Thanks in advance for any thoughts.