i don't think i've seen this place posted here before
but there's a relatively new british foods store on california, near polk (1526 California) called "you say tomato"
they have a lot of british foods, from various walkers potato chip flavors (like ketchup and steak) to pickled onions and stuff. some of the same products can also be found at cost plus for less but not all
what i really like is the freezer section where you can find bangers, european style bacon (non-streaky), and other frozen goods