I recently spotted these gorgeous heels on Pop UK and I almost turned green with jealousy. The gladiator style t-bar heels are perfect for summer and although they're quite high are apparently amazingly comfortable!
They're by Carvela so are available at Kurt Geiger stores and ASOS (£75). Team them with flared jeans or use them to add a hard edge to a pretty summer dress. Maybe keep a pair of flats in your handbag though, just incase!