Looking at trying to make it look a bit more mean and less taxi like any one got recommendations???

Forgot to mention its an diesel 09 plate 2ltr turbo

How about one of those Magnetic Roof Signs that Driving Instructors put on the roof with a 'L' on it.

This thread should give you some ideas

http://www.briskoda.net/forums/topic/151725-you-are-doing-it-right-the-big-skoda-octavia-ii-picture-thread/page-81#entry4258854