It'll never happen
As someone who used to work for a company providing infrastructure to the 52 (that's right 52!) separate police forces across the UK I can tell you that this will never happen.
Just look back to the proposed amalgamation of police forces a couple of years ago. The various police PR machines and the Association of Chief Police Officers cranked in to action faster than you could say "Stop thief" to paint a picture of inefficiency and claimed that every small town in the UK would become a wild west of rape, murder and drug dealing.
This had nothing to do with how effectively the police could do their job and everything to do with the fact that ACPO realised that their jobs would be under threat and that they wouldn't be free to run their own private police forces like a parochial vigilante club.
The only thing that the various police forces hate more than crims is each other. It's sickening to see the petty rivalry that takes place between forces. Everyone is implementing their own programmes and replicating massive amounts of resources. When they run out of cash they know that they can just stoke up fears about terrorism and drug crime and the Fascist Home Secretary (whoever that may be at the time) will hand out more.
Sure this does mean that some forces come up with some quite innovative IT projects but this is only useful if there was the remotest chance that the most successful ones actually stood a chance of being implemented on a national scale. Instead, the usual approach is that every other police force childishly rejects it because they don't want to be seen to be using a solution invented by some competing force, preferring instead to push on with their own pet project. The level of waste is sickening.
Having said that, given the fact that the police have been let off the leash and are now have legislation in their back pocket that allows them to arrest you for just about anything, it's not a bad thing that they can't find their arse with an atlas.
Paris cos she knows what to do with cuffs and a police uniform