Not much point in emailing them I'm afraid, it was a mistake on your side.Is there any point in me emailing to explain my clumsy error in hopes of them reopening my case saving me money and more importantly time?
I'm also worried if I don't explain myself they will think i was trying to hide something and it will affect my next application
Don't worry about it impacting a future application - unless you deliberately gave them false information, this wouldn't be counted as misrepresentation.