I am looking for a special occassion restaurant for a 70th birthday. We have a party of 6 with diverse diets from omnivore to vegetarian and a vegan. We will be staying in west London and our trip is in mid November. All adults, no children.
We enjoyed The Shed in Notting Hill. Countryside chic, small and large plates, emphasis on local and wild farm-to-fork sourcing. We liked the cozy atmosphere and really excellent food, and it's a short walk from the Notting Hill Gate station so no car needed. Website: theshed-restaurant.com
My favourite special occasion restaurant in west London is the River Cafe: https://www.rivercafe.co.uk/
Amazing Italian food, right on the river near Hammersmith. Definitely book in advance if you want to go. I'm not sure how they cater to vegans, would be the only issue. They might be able to make some dishes vegan?
Not knowing your budget I will suggest:
Cote St Christopher Place