I've been looking for this for some time, but didn't want to pay more than £100 for it.
The going price on Amazon is around £120 and the next best price is at Crescent for £111 (but they had stock issues).
I came across this item on eBay from BroadbandBuyer, they have it on special offer (their website still lists it at £117).
Tech Specs and info:
The BiPAC 7800N series is an all-in-one ADSL2+/Broadband Router that offers users the flexibility of multiple Internet connections and expanded wireless coverage. All this is offered while maintaining high-speed broadband access via ADSL2+ or through an Ethernet WAN. The integrated 802.11n Wireless Access Point ensures the Billion wireless router offers faster wireless speeds (up to 300Mbps) while two built-in antennae effectively search for wireless signals. The BiPAC 7800N automatically adopts the optimal connection to deliver smooth, constant signal reception even if obstacles are present. The Billion BiPAC 7800N series is equipped with a second Ethernet WAN interface, which can be used to connect to an external broadband modem. This unique feature frees users to add fibre-to-the-home (FTTH) services when they become available. Users can easily enjoy highbandwidth applications such as High Definition IPTV services without changing their home network. A robust Firewall is also built in to provide protection against hacker attacks while the Quality of Service feature prioritizes queues and traffic for applications such as music downloads, online gaming, video streaming and file sharing.