I've really messed up I have two litters here and I have sent off to register my first litter stupidly putting the other side to my second letter on there I've sent it all in has anybody else done this before and what happens as I need to change the name of the sire is it a simple phone call and I'll do it over the phone I'm praying it is.

You must contact the Kennel Club to correct your mistake...that is the only option.

I know this  i just wanted to know the procedure is it a simple ammended they do

Has anyone gone through this

The simplicity may depend on if you own the sire of the first or 2nd litter, sent registrations via post or online.

I dont own either
One is my friends...the male is was supposed to name on reg.bred by me..
I did it online

As said, you can only talk to the Kennel Club Registration Department.   It may appear on the KCSB Records as an amendment.

If they haven't been processed yet then they will probably be able to sort it over the phone