Preheat the oven to400F/200C. Cut the sprouts in half and remove the hard stems at the bottom as well as the outer leaves if damaged.
On a large rimmed baking sheet toss together the sprouts, olive oil, salt and pepper, thyme leaves and chopped bacon. Place the brussels sprouts on the baking sheet cut side down for maximum caramelisation. Roast in the preheated oven for 15 minutes. Meanwhile mix the honey and vinegar in small bowl.
After 15 minutes take them out of the oven and drizzle with the honey and vinegar mix, stir to coat evenly and roast for 10 minutes longer. Then broil/grill (UK) for 1 minute for the crispy exterior.