Welcome to digital TV.
A few years ago ITV, although regionalised, had one TV channel to play with and that used to contain repeats. ITV now has four 'main' channels plus the childrens' dedicated channel. Unless they commission 5 times more programming there will never be enough new content to fill their airwaves.
Now consider the other companies that have multiple channels.
And then there are the companies that do not commission new programmes at all; they are based on showing repeats but rebranded as 'classics'.
500 channels and nothing is on!