The Isis Adventure Puzzle

From the official 'The Isis Adventure' website:

The Isis Adventure has begun.
25/09/06

SonicWarp Ltd announce the start of the Isis Adventure. To take part entrants will need to solve the isis puzzle. Clues to open the isis are provided with each order. One free isis will be hidden somewhere in the U.K, to mark the start of this truely unique event.

You can view the official 'The Isis Adventure' website at http://www.isisadventure.co.uk.

The 'Isis Adventure' game/puzzle 'Isis I' was also featured on BBC 1's 'The Jonathan Ross Show' on 29th September 2006.

Source - http://forum.digitalspy.co.uk/board/showthread.php?t=469517.