Not the most in depth research, but Wikipedia does have a page on UK dog attack fatalities.
Between 2010-2019 there were 27 fatalities.
The most frequently mentioned type of dog is (involved in 13 deaths) are the Staffie/pit bull terriers. Second most mentioned (involved in 9 deaths) are American bulldog/unspecified bulldog types. 4 involved a mastiff, 2 a GSD and then a mongrel, malamute, JR terrier, Lakeland terrier and an unknown. To put that in an easier list:
Staffies/Pit Bull types - 13
American Bulldog types - 9
Mastiffs - 4
GSD - 2
Mongrel - 1
Jack Russell - 1
Lakeland - 1
Malamute - 1
Unknown - 1
I’m sure a Well Actually will be along shortly to say that staffies aren’t dangerous.