Usefull site for finding your local transmitter when tuning your DVB input source and location

Will tell you your local transmitter station and help when scanning for channels (Scanning All Channels/All reigons can not help at times)
There is also a list of Analog channels as well if you need it

Hope this helps

For further info there is also the information on the UK freeview switchover (when Analog channels like analog BBC 1 are going to be switched off - dont panic got a few years left yet and time of post)
Link here