During the practical driving test, how should a candidate react if the GDT examiner gives a route instruction (e.g. 'Turn left at the next junction')?

1. Turn at once from whatever lane you are in, since the examiner has already judged it safe
2. Ask the examiner to confirm the route in English before committing to any lane change
3. Carry straight on and take the following junction instead, where the turn is easier to set up
4. Check the turn is permitted and safe, check mirrors and blind spot, signal in good time, then turn smoothly