"ARW" wrote in message
news
"A National Grid spokeswoman said the record level of solar power was
achieved largely because of to the clear and sunny weather on Friday."

http://www.bbc.co.uk/news/business-40058074

Not my grammatical error as I copied and pasted.

Yes, the author evidently half-changed "due to" to "because of" (or
vice-versa).

I think it was one of the Inspector Morse books where Sergeant Lewis
couldn't decide which was correct, "owing to" or "due to", and Morse advised
him "just use 'because of', then you'll always be correct". I can never
remember the rule, either, so I follow Morse's advice :-)