Decent portion but you will definitely want to order sides.
Although very tasty, the Wellington would not be enough eaten alone. I wrote a little review on Google so you ought to check with that for specifics. Basically it's good, not the best, and a little too salty. Service is impeccable though.
I've had the beef wellington and it's a great portion. If you're concerned about it, you can always go for dessert afterwards. They have some excellent choices for dessert as well.
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