Maverick. Mirroring Screen to TV Airplay Icon Not visible in Menu bar

Hi,

I recently upgraded my OS to Maverick 10.9.1 from Snow leopard. My Laptop is a Macbook 13" Aluminium Late 2008.

How do I get the Airplay Icon to appear in the Menu Bar so that I can Mirror whats on my macbook to my Television. This is the only reason that I upgraded to maverick as I was informed in an Apple Store that this is what I needed to do.

I have apple TV,(May 2013) and my Itunes is registered with this TV and works fine, as does my Iphone. I have also updated the apple TV with the latest software.

I have looked at the Display in preferences, and the show Mirroring options in the menu bar when available is ticked. There are no other options.

I can choose Apple tv in my sound options as my Output, so the macbook recognises the Apple TV, but only with sound, not Mirroring.

I hope this makes sense. I have gone through all of the apple help pages, and I am still no further forward.

Thanking you all in Advance

Greg Simms