Due to/Owing to?

Welcome to Grammar Thought the second.

Here it is.

I've been wondering about this for years and finally got round to asking my Dad last week. When should it be 'due to' and when should it be 'owing to'?

Well, it's simple but perhaps tricky to put into practice.
Due to: adjectival
Owing to: adverbial

So 'due to' is there to describe a noun: if you wanted to describe the weather (noun), you might say, "This weather is due to a depression in the Atlantic."

'Owing to' is there to explain a verb: if you wanted to explain why Spud is limping (verb), you might say, "Spud is limping owing to his bad foot"

There is no logic to this one - they both mean the same thing - but it is a convention.