Why do the BLANKS in World’s End (Last film of the Cornetto Trilogy) have BLUE BLOOD?

Three Flavours Cornetto Trilogy are :

Shaun of the Dead

Hot Fuzz

World’s End.

BTW : World’s End exists. It’s in London. Kensington & Chelsea.

The same Kensington & Chelsea Council that allowed the Grenfell Tower Disaster to happen.