Muso i looked up the web and found the frequency, polarity and symbol to change when you install your channels again – BBC4 and CBeebies are 10,803 frequency, polarity is horizontal and symbol is 22000 . They will work for you then. There are sites on the web that show you exactly how to do it – your installers should not be charging you 35 euro AGAIN ….robbin b **** 🙄