Homemade coleslaw =].
Scotch eggs - or maybe mini savory eggs?
There are many variations of the Pimm's Cup (arguably the most quaffable of summertime drinks). Here's my perfect Pimm's: Mix 2 parts Pimm's to 3 parts sparkling lemonade (Lorina's is my favorite) over ice. Add mint, cucumber, orange, and strawberry. If you're feeling saucy, add peach slices or maybe some Hendrick's gin. Invite friends over for Pimm's o'clock.
Macaroons - Cannot wait to try this, looks simpler than I imagine (probably not true.)
Mini sausage rolls - how could you celebrate the Queen's reign without them!