It’s not a conspiracy; the City of London police, alongside normal local duties, have a national responsibility for many kinds of economic and cyber crime.

This almost certainly comes from long experience investigating fraud and other financial crimes amongst the businesses and people based there, to a degree and level of complexity not found in other regions of the UK.

For instance they host Action Fraud for the entire country.

If you want to talk about enforcement priorities, contact your PCC, or better yet, right now, your local candidates.