Your Samsung UE40C6000 TV appears to have been available across several countries rather than just Russia. That's fairly common amongst manufacturers. The TV software allows a menu selection for the country where the TV is being used, and hence adapts the TV tuner to local conditions. Once that is set, then the TV remembers its country setting.
It is possible to reset the TV to factory default and so then enter a new country. Do this with the following:
Select Setup - Plug & Play (Initial Setup). Enter your 4 digit PIN number. The default PIN number is “0-0-0-0.” If you want to change the PIN number, use the Change PIN function.
This is from page 7 of the User Manual. These can be downloaded from the Samsung website if you've lost or can't be arsed looking for it.
Let us know if this doesn't give you a UK option. It will help others looking on Google in the future.