It is programmed in such a way that it will start Power mode much easier at low speeds than at high speeds.
You will notice Power mode comes on very easy if you floor the boot at 30 mph.
It might not come on at all if you hit the carpet at 80.
Joe
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Black Betty [Bam a Lam!] '93 UK spec, still languishing
Betty
Jersey Girl Silver '92 UK [Channel Isles] 40K
Jersey Girl @ Mersea
Candy Purple Honda Blackbird
Plum Dangerous
White X2 RVR Mitsubishi 1800GDI.
Vantastic
40,000 miles Jersey Girl