Astra J mk6 esp service fault

When the lights are on, the car drives fine.
When the lights go out, the brakes feel like abs is kicking in all the time, even when I'm braking very lightly.
Taking in under warranty in the next week.
Will update this description if I find the problem cause out.

The light on the left is the ESP light, the light on the right is the ABS light.

Sorry for the poor quality, I really don't understand iPhone...

UPDATE
Had it fixed yesterday.
Turns out it was a wheel speed sensor. They are under £20 on eBay.

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