Heat oven to 200C. Put the onions and peppers in a roasting tin, drizzle over the oil and vinegar and season well. Roast for 10 mins. (Oh, I didn't read that bit)
Nestle the sausages, tomatoes and thyme, if using, in and around the veg, drizzle over the honey and cook for 25 mins more or so, turning the sausages halfway, until the sausages are cooked and everything is golden and sticky. Serve with mustard mash or crusty bread.