I am certain I caught Covid on a coach journey, it was the only time I was with other people in a confined unventilated area for hours. I took a trip up on the Friday and returned on the Sunday. On Tuesday morning I had a negative LTF and started to develop a (looking back on it) Covid headache. By Wednesday lunchtime I was coughing and felt awful and had a super strong test.
So did I catch it on the coach going up or coming back?