At 6am on 3rd September 2010, Virgin1 'lost its virginity' (according to the continuity announcements made through the previous day) and became 'Channel One'. When Virgin Media Television was bought by BSKyB and became The Living TV Group, the licence for the Virgin name was not carried over, hence the required change in identification.
The full Channel One ident from which all the other idents and stings are taken. Very rarely used.
The most regularly used ident comprises of the last three parts of the full ident.
For very brief intros, just the final logo part of the ident is used.