National Express West Midlands No.4339 - BX02 AUN was a Dennis Trident 2 SFD334BR2Y with Alexander ALX400 H47/28F bodywork which was delivered new in 2002. (It has now been withdrawn from the NX WM operational fleet).
The Trident chassis is a 2-axle low floor double decker chassis and was very popular with a number of bus operators in the UK.
Alexander ALX4OO was the forerunner of the hugely successful ADL Enviro400.
Here on Street View in August 2009 No. 4339 is seen on Yardley Wood Road close to its junction with Brook Lane, it is wearing the blue, white and red livery of Travel West Midlands which was part of the National Express Group.