Will One Missed Payment Wreck My Mortgage Deal?

I’m really close to drawing down on my mortgage after a long process, but I had a small hiccup over Christmas. My standing order didn’t go through because my account balance was too low, and I only caught it about a week later. I paid it right away as soon as I noticed.

A friend of mine thinks this late payment might be a huge red flag for the bank and could jeopardize the drawdown. Another friend says it’s not a big deal because it was under €1,000 and sorted within 30 days. I’m torn on whether I should tell my broker or just let it slide until someone brings it up. I’m worried something so minor could ruin the whole deal.