The company that installed our wireless are based near Basingstoke, they came out and did a live survey of our building and then did a great job of installing the AP's and setting everything up. When it was done they did another survey to ensure that we had the 100% coverage that we wanted.
The Trapeze Wireless allows us to have multiple SSID's, we have one for allowing the staff to have secure access, one for wireless voice and one for guests. The guests SSID uses a great peice of software, called SmartPass, that allows us to create users (without having to add them to AD) that have specific limits on the times that they can use the wireless network for and when that time expires, they get automatically removed from the network.
Our wireless voice SSID is locally switched, that means that all the traffic does not get sent back to the wireless controller. It gets placed directly on the VLAN, which reduces latency. Thus improving the quality of the voice call.
Our secure staff SSID uses bonded 802.1x authentication, which im sure you're all aware is currently the most secure method for allowing wireless access, as both the user and the laptop have got to be authenticated.
PM me if you would like me to forward you some contact information.