Thank you so much. I had no idea New Look did an occasions range, Chocolate and Goulash. This is her favourite shop so I'm sure she'll find something she likes here.
She does love jumpsuits, namad and Semaphor and would like one but not for the wedding. 
We had looked in Quiz, fauxfox but online they have more skater dresses. If I was 35 years younger, I would be buying one of those for myself.
That's a nice dress, Nap but she's fussy about colour as well as style, so wouldn't wear that.
Thanks for all your suggestions, Sookie and to everyone else for their help. There are so many suggestions, I am sure that we will find something here.