The headline is somewhat mistaken in that it talks of "UK police staff" yet the article only provides information on England & Wales, nothing about Northern Ireland or Scotland which have their own separate police services.
Do "parliament street" think the UK is just England & Wales or is that just sloppy ignorance from The Register, you would think that The Register's journalists would know that, especially the bit about the ICO only covering England & Wales as far as policing FOI requests are concerned