Returned Direct Debit Fee?

Hi Everyone

Thanks for reading! I'm looking to find out how much banks/ providers charge for the above.

A google search does nothing for me and I have looked at many websites and have found nothing.

If anyone can tell me what the charges are for each or any bank that would be great!

I'd also like to see a copy of the letter they send if anyone has one, or if you can point me in the right direction :)

Many Thanks :D