Some very long conversations and one sleepless night later (on my part that is, she was exhausted) here are the facts as dd told me last night
Fact - man approached her on Wed asked would she like some choc as he had some that he couldn't have. "Check with mum and I'll give it to you next time I see you"
Fact - dd told me re above and I said for her to politely refuse offer and carry onto school.
Fact - man approached myself and dd yesterday to offer choc with me present. I politely refused explaining dd couldn't have choc. Man not bothered and said would give to someone else. I said maybe not wise to approach kids on way to school. Conversation ended.
Fact - dd went into school, panicked and went and told teacher that she didn't like man talking to her and that he had offered choc but mum was aware.
This is where it gets tricky, dd was distressed and by her own admission exaggerated/lied about some of the details and nature of approach. As a result of this man was approached by headteacher and warned not to speak to kids as he had upset dd.
DD very upset at all trouble caused and is being taken to school early to apologise for actions yesterday. However, the issue still remains that the man still approached her, innocently or otherwise, and offered choc.
Feeling very lost, confused and sleep deprived. Will have to think things through more when head is clearer