plain (the original) hob nobs are vegan
many supermarket own brand biscuits are vegan, such as asda's "nice biscuits"
If you surf the net, you might find some more!
otherwise, you can bake your own.
Crisps are quite easy to find too, most ready salted flavour crisps are vegan.
Also, kettle crisps label which of there crisp are vegan and they are gorgeous!