A large percentage of the population in those countries are Indian. They cook the food to suit their palates not British palates. They don't use curry powder
I didn't just go on a one week holiday.
Quite a lot, abroad and here, at home, are Pakistani, not Indian; although called or classified as Indian. When I visit, with local Pakistani friends, they usually order off-menu. The speed and art of clearing a plate of food using only a Chapati is simply astonishing.