Is Too High of a Credit Limit Bad?

Hi all!

I recently got limit increases on 2/3 credit cards that I have, which makes my current credit limit around £2600. I'm currently 18, I only use one card at a time and keep the other 2 locked, but have been told once that having too high of a credit limit can affect your credit score negatively, etc. I was wondering how high is too high. I only ever use a few hundred a month (for fuel, etc) & pay it all off within the allotted period, but don't want to continue accepting future increases if they may harm me negatively.

Thanks!
Kian