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I saw this on the back of a van today. How would you fix the punctuation?

Correction

"Just had the nicest engineer come and sort my boiler out. Sadly, I didn't catch his name but well done!"

This is an example of a COMMA SPLICE, and it's a really common mistake for native speakers.

With my students I often call this a "run-on sentence", though this is something slightly different.

I can never remember what the difference is, so I'm borrowing this good example.

COMMA SPLICE: Tony is dishonest, he steals data for a living.

RUN-ON: Tony is dishonest he steals data for a living.

CORRECT: Tony is dishonest. He steals data for a living.