Boiled sweets with any kind of fruit flavour = no
Barley sugar = maybe, I'll need to check.
Honey = no
Maple syrup/golden syrup = yes

lemon juice = no
citric acid = yes

menthol/eucaluptus oil/mint/aloe vera etc = no

However, celery (the wonder vegetable) seems to help me clear the throat - it's probably the bulk combined with the moisture, and it's an anti-inflammatory.