It seems that most Express headlines fall into one of these categories:
3. The EU/Euro
5. “Migrants”, benefits, “skivers”
Exceptions seem uncommon. Okay, you get the occasional “royals” story, and there was a time when house-price rises/falls could have been added to the list. See for yourself, using the compilations of front pages, below (which I’ve colour-coded to match the above categories).
Occasionally, two of the topics are combined in one headline (see example, above left – “ALL MIGRANTS TO GET A BRITISH PENSION”).