It would be helpful for you to know what your levels actually were when you felt like this I think
@Taffyboyslim , as it can affect the most appropriate choice of treatment, and the urgency.
Some people find that as their levels reduce from having been quite high for a while, they can get some of the symptoms of mild hypoglycaemia (feeling super-hungry snd a bit shaky) when their levels are still within a healthy range, but just comparatively low for them.
It that circumstance, something lower carb, and more gentle acting (perhaps a plain biscuit or small section of a cereal bar) may be enough to reduce the symptoms without causing a big spike back up to higher levels.
However, if your levels are near or below 4.0, you could be at imminent risk of hypoglycaemia, and would be better treating with 15g of fast-acting carbs, and then rechecking in 15 minutes, and retreating if necessary.
Do you have a BG meter you could take with you when out and about?