Preheat the oven to 200℃/180℃ fan (390℉/355℉).
Line a baking tray with baking parchment. Peel all of the vegetables and slice the parsnips and carrots into batons.
Tip the vegetables onto a baking tray. Drizzle over the oil and honey. Sprinkle over the thyme. Season to taste with salt. Toss well to coat and spread the veg evenly over the tray,.
Roast for 1 hour, tossing every 20 minutes. If the veg is starting to char too quickly, cover loosely with tin foil.
Remove from the oven and serve! These are the perfect accompaniment to any Sunday roast.