Video & WiFi problem with Wheezy on Lenovo E535

[Andrew Wood <andrew@perpetualmotion.co.uk>]

Im trying to setup Wheezy with Gnome 3 on a Lenovo E535 which has an AMD 
Radeon video chip and a Broadcom WiFi chip.

Despite installing the b43 firmware packages dmesg | grep 'firmware# 
still shows:

 3400.531552] ieee80211 phy1: brcmsmac: fail to load firmware 
brcm/bcm43xx-0.fw
[ 3400.531561] ieee80211 phy1: brcmsmac: Failed to find firmware usually 
in /lib/firmware/brcm

Also I can only get Gnome 3 to launch in fallback mode.

xserver-xorg-video-radeonhd is installed as is libgl1-mesa-dri and Ive 
installed firmware-linux-nonfree

This is what lspci shows:

02:00.0 Network controller: Broadcom Corporation BCM4313 802.11b/g/n 
Wireless LAN Controller (rev 01)

00:01.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI 
Device 9992

Any ideas what the problem is?

Thanks
Andrew