I have been an idiot.
I pay off my credit card bill in full every month, but not by direct debit as it is paid off from different sources depending on circumstances i.e. if they are work expenses it is a different account to say home improvements
Anyway, last month I completely forgot to pay it. Only realised when next statement came in and I had a penalty payment. I then paid it immediately. Balance including penalty was approx £90.
How much will this mess up my credit rating? We are due to remortgage in the Autumn and am worried I have stupidly screwed us over.