In the Northern part of England it is very common to go to a fish and chips shop and order chips with curry sauce. The curry sauce you get in chip shops is different from the sort you would get on an actual curry at an Indian takeaway. It tends to be a bit sweeter and considerably more mild in spicy heat. People eat it either poured all over their chips (ie steak fries) of in a pot on the side where they dip their chips. I found this version on a blog and it sounds very close to the type I enjoy.