How do you activate the ESP system on a Vauxhall Vectra?

Does anyone know how to activate the electronic stability programme for a 2008 Vauxhall Vectra (UK model). Its apparently done using the car key.|||it depends what model it is elite, life etc. Some don't come with it as standard if they do, it should be permantly on|||I guess its on all the time, I had a 2005 vaxuhall astra sri cdti, I had to hold down the sport button to turn off the ESP system but i aint sure if the vectra as the same system, It should tell you in the owners manual