A huge rebrand of the ITV network of channels has taken place today.
The changes see ITV1 renaming back to its original name of ITV (names for ITV2/3/4/CITV remain unchanged).
Your EPG will reflect the new channel name for ITV.
ITV1 HD has also been renamed as ITV HD as part of the rebrand, and ITV1 +1 has become ITV +1.