Has anyone encountered an exhaust fume smell when the heating is on ? Car is a 57 plate Octy VRS.

I get one when the engine is first on if I sit there for a minute or two, but other than that I get nothing. Could be an exhaust leak somewhere in the engine bay maybe?? (only thing I can think of)

When I first got my car I noticed this a couple of times but then realised it only happened when I stopped too close to the car in front in a queue.