Cheers, Mike. It made more sense to add an HTML br tag to the code for the specific ad causing a problem. It worked a treat.
I know you guys do theme installations at a price, but do you also do modifications as well?
Many thanks for your help!

Thanks, but it didn’t work. The first option worked on the sidebar but not on ads in the post. The second option did not work at all, which is just as well since it’s a solution that would be overwritten on the next theme update. I’m using a child theme. Is there an option that would work there? Any further thoughts?

Thanks. Duly noted.