Available on all formats
I'm aware it's cheaper at Game and Asda, but this includes an additional guitar.
link is to Wii version, but all are back in stock
Guitar Hero IV: World Tour (Bundle)-
Guitar Hero World Tour delivers more ways to play than ever before. Virtual musicians can live out their rock and roll fantasies by playing either a single instrument, or any combination of instruments, in addition to the full band experience.
In addition to all of the online gameplay modes from Guitar Hero III: Legends of Rock, Guitar Hero World Tour introduces Battle of the Bands mode which allows eight players to join online and challenge each other band-to-band to determine who is the best of the best. In the Band modes, up to four players can jam together, online or off, as they progress through the game, and in single-player Career Mode, players can jam on any of the instruments in branching venue progression enabling them to rock out in the order of their choice.
This version of the Guitar Hero World Tour package includes everything you'll need for the complete GH experience -- packed in are the game as well as a guitar, microphone and drum kit.
Biggest selection of on-disc music with 86 master tracks
Innovative Music Studio - Compose, record, edit and release your own music.
Battle of the Bands Mode - Rock out in Solo Career Mode or battle against other four-person bands online.
Create-a-Rocker - Customise your own rocker or choose from several in-game music artists.