Chris - the different types are there for the different MAKES of cars as they hvae different crank signals.
As far as I can make out, Vauxhall use the same signal so it should be ok but give Gerry a call to find out anyways - 0845 345 4045
Gary - no offence meant but I think you can do a hell of a lot more damage to a turbo car when "learning" than a N/A car so its not something I would wanna try without prior knowledge.
If your not interested in complete ECU change John then the Unichip is the best you can get. The extra boost module runs the boost but still allows the ECU to see the it as well. What you do is program the boost module to the cut limit you want and when it reaches this then the standard ECU takes over and cuts the boost as it normally would if it was over the limits.