My staples are usually;
Sainsbury's Be Good to Yourself Tortilla Wraps (I find the WW ones hard to fold and they always break! Same PP value anyway)
Reduced salt and sugar beans
Wholemeal pasta and brown basmati rice
Sugar free jelly (sachets for making jelly for home, pots for work as it's less mess)
Velvet Crunch crisps or Walkers Stars
WW cookies from Poundland for large boxes
Low point cereal bars either from meeting or elsewhere (2-3 PP each)
I do a lot of cooking so the rest of my shop consists of the usual fruit/vegetables/meat and soups for lunches, although I buy less tinned soup now and just take some homemade soup in a flask.
As for luxuries I usually pop into M&S's food hall and pick something from there since they have a nice 'guilt-free' snacking range. I love their crispy fudge bars which are 4 PP each, or the chocolate and pecan popcorn which is 5 PP a bag, but these are for when I have points to spare! Curly Wurlys, Freddos and Fudge bars are my other favourite treats for 3 PP each.