well done you for trying to accommodate...
its right that you can buy kinnerton advent calendars that are nut free
(look out for their 'nut free promise' logo.
fab bakin boys do nice wee nut free cakes, as do just love food company (can get them from sainsburys)
Be very careful of ice creams and desserts etc
walls vienetta is safe.
perhaps ask the family what their child likes and we will be able to help you find some nut free alternatives.
I would avoid having anything that actually contains nuts/peanuts due to cross contamination risks etc.
never buy anything from bakery etc
Also check shampoos, soaps, lip balms, moisturisers etc
With foods you will have to read every label,
perhaps get him his own wee plate, bowl and cutlery as I have known kids to react after eating something from a bowl that had previously been used to eat crunchy nut cornflakes. (obviously was washed between uses). Plus would be a nice wee gift for him.