[sportutegrl]

I can’t believe the list didn’t include spotted dick. (English Pudding).

[Mitch86]

The reason for that is almost certainly because this is a database of regional slang and Spotted Dick is a) not slang and b) not regional

[Vanders9]

That's because "spotted dick" isn't a regional expression, or if it was, it has long since gone on to national level.

In the black country we sometimes used to refer to it as "spotted dog".