Thanks for your reply! There's no restriction on shoes at all, the bride doesn't mind what we wear.
I'm a size 4, shape of foot I have no idea!
I saw the over budget ones you posted, and went to look at them but don't like them in person. I'm not sure why, because I did like them online! The heels are a little too low on the second pair and I think the first pair are similar to the others really.
Thank you for your help though.