Marshmallow Fluff - I can find it in my local waitrose in the kosher section, but I doubt that is the norm across the country. Funny enough - I bought a jar yesterday. I only ever eat it by the spoonful!
Rice Krispy treats - I have seen the marshmallow ones around at English School fetes and such, but I think the chocolatey ones are more common. The marshmallows are definitely different here and there is the pink marshmallows, which I feel would taint the RK Treats. I tend to either bring bags back or if really desperate, buy the american ones at the likes of Selfridges or other small stores in London, which cater to Americans.
To the original poster looking for ideas. If your husband doesn't have far to travel, or it is easy for him...my office mates LOVE american style cupcakes. I mean - LOVE. I can bring in 3 dozen and they are gone by lunch time. I only work with about 30 people, so some people are having two!
I made toffee cookies this weekend, that my english friends loved. Basic chocolate chip cookie recipe, but substituted the choc chips for crushed up toffee (i.e Heath bars, Daim Bars or Skor bars).
