If there's no gift list or if you'd just rather give a surprise present, why not treat newly-weds to an indulgent Turnham Green hamper to help them start their marriage in sheer wedded bliss:
Celebratory Sparkler(£40)
Condimental(£40)
Summer(£40 / £50)
Fine Herb(£80 / £90)
Perfect Piquance(£80 / £90)