Most of the double mini roundabouts have a similar make up to the image shown.
There is a left, straight ahead and a right. The left and right may involve either one or both roundabouts, depending on which direction you approach. The ahead will always involve both mini roundabouts.
When going either left or right (whether it involves one or both roundabouts) simply signal your intention (if it involves both roundabouts) keep the signal on for the second roundabout, ensuring that you also look on approach to the second roundabout as you would for the first.
This image shows the blue learner car going ahead at the first roundabout, do not signal as it is more likely to mislead, you are not going left or right.
