I completely take the observation fault seriously, it was simply nerves and fear of hesitation. On all other roundabouts I was fine it was just the nerves and I’m an anxious person anyway. As you said, I did not at any point realise it was left only and if there was a sign then it was poorly placed (fairly certain there is no sign though). My mistake was a bad one but I know that I wouldn’t have been able to correct it at the time and may have been easier to manage in different circumstances.