Investigation has established a turbo hiccup with 1.2TSI 105 DSGs. But the main problem is VAG's insistence on a brake interlock. On all VAG cars, you have to touch the brake pedal to move the lever from N to D. The system communicates via the brake light switch that can be slow to react. And there is also a programme that prevents the car being accelerated when the car's systems think the brakes are on. The result is you can move out of a side road or onto a roundabout on the fuel already in the engine, then about 3 - 4 metres into the manoeuvre, the engine momentarily and heartstoppingly cuts out for a second, before clearing and accelerating as normal. The answer is to get well off the brakes entirely before accelerating, which can make emerging into gaps in traffic very difficult.