I have stocks of branston, salad cream, hp, piccalilli (the latter two for other half!) all sorts! We keep a running shopping list for the UK for such things... I always buy a few of those big tubs of sweets at Christmas and they last a year (or more, depending on the percentage of diet days to treat days in any given year!!)... so no, not a lot I miss per se that I can't get here...
A colleague comes over very frequently in the summer as she has a place near Dover so I often ask her for one thing (sugar free jelly this time - I'm addicted - just 1/4 of a sachet a day but I love it!!!)