UK business have got used to the .co.uk domain TDL for many years now. But a shorter .UK is coming very soon, actually in about a month on the 10th June 2014.
You can ready more about it here. http://www.dotuklaunch.co.uk/what-uk
It will not replace the .co.uk domain extension (TDL), but will instead reflect an easier and shorter way of getting to your website for visitors.
Please feel free to contact me to pre-order your .uk domain name and link it to your website.