[access-uk] digi Tv

high, i've got a problem with my digi tv, its a product from nebula 
eloctronics. the problem i am having is that i am unable to tune in to ITV1 2 3 
and 4 and also channal 4. i've tryed to play around with the settings, but it 
still wont pick up those channals. i know i can get them because i did pick 
them up, but then i kneeded to re tune them. 
please. if any one has a digi tv box, can they let me know how to receve those 

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