A series 2 from the front the Bonnet/ Grill is different, The headlights are a different shape and the front bar has those round fog lights and indicators in it. A series one has that funny grill with emblem on it and less angualr lights
From the rear the series one has that low rounded wing whereas the series 2 has a higher squared off wing
No difference in performance
PS prepare for heaps of people to tell you to search