Good choice on the custard creams and the onion rings. I was thinking about getting some onion rings myself, I did that last year. Sainsburys own brand in the big green bag are pretty choice.
I like tortilla chips, so might grab some of them.
Top Tip: Sainsburys Economy Tortilla Chips are pretty average. A bit too chewy. If you want Tortilla Chips from Sainburys, I recommend a brand name bag. I think Waitrose did some decent Tortilla Chips for me one year, but I can't really remember. Waitrose is rubbish, and I don't like shopping there.
Also, probably get some Mince Pies in. I had some posh ones my mum got me, but my friend and his kid's game round and we ate them. Might need more.
Actually, after they'd gone I replenished my crisps supply. I have a six-bag of Walkers Salt and Vinegar, a six-bag of Walkers Cheese and Onions and some Mccoys. They won't all get eaten by Saturday.
So may raid them at some point.