Apologies for size of image but this one shows the First Logo.

Here's an very early "First" branded GER train as you can seen the pattern is slightly diffrent at the front it is most noticeable

Secondly the "one" livered train

This was the only "one" livery I could find on the net, sorry for the colour quality but that's the lighting at London Liverpool Street
Finally the old "Network South East" days

BTW this is the only current GER stock that has gone through all three changes (NSE, First GER, One GER)