Is my Christmas Cake ruined

Hi,
I'm really upset as I went to a great deal of effort to ensure I had all the best ingredients for Delia's Traditional Christmas Cakes. I was making one as a gift and one for myself - foolishly I used the wrong four in one of the cakes (I used self raising and should have been plain). I realised by the time I was on cake no. 2 fortunately.

Is it ruined?
Many thanks,
Elizabeth