Smart casual is the best approach - avoid trainers, tracksuits, baseball caps and the like. But there's no need to be so formal as to wear a tie. I settled for smart shirt open at the neck, trousers of a decent lounge suit (it was a warm July, so a jacket would have looked silly!), nice shoes. My partner wore a simple summer dress and smart sandals.
Hope this helps. Enjoy your meal!
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Fishmore Hall Team