Sounds a great idea.
Perhaps it would be wise to discuss your plans with Sunset management before you arrange outside catering. You may need their permission.
Motif restaurant on the prom specialises in traditional Turkish food and is run by Nichola who is also a CBF member. I don't know if they do outside catering but I can recommend their quality and range of food. Nichola may also be able to put you in touch with other suppliers.
I hope you can get fixed up and go ahead with your celebrations.
Best of luck and a Happy 40th birthday to your wife.
