I'm probably being ignorant but is there really a big difference between cultural appropriation and cultural assimilation? I only ask because over the last forty years or so, integrating other cultures into our British one has improved our cuisine*, fashion, and attitudes** (generally), to name but a few.
* This used to be the classic meat and two veg with the veg being boiled to a grey mushy lump for the most part (although this might just have been the standard of my families cooking ability
) Either way, restaurants in the 70's did not offer much variety or quality, if I recall correctly. Nowadays curry, for example, is a traditional British dish and a recognized part of our cuisine.
**I still remember the days of signs outside of boarding houses saying "no blacks, dogs, or Irish". I was always quite proud of my grandparents, who took lodgers, for never subscribing to this commonplace rule.