investigate crime.
The Met police don't even bother to investigate most burglaries now, the idea the Special Branch budget for including Andrew who as a son of the monarch will still always be a potential terrorist target whether doing royal duties or not would make any difference is not realistic
The Met police claim they dont have the resources or manpower, yet they can find resources for round the clock protection for Andrew, who lives in the same place as his mother and spends his days driving and riding round the Windsor Estate. And yes, that was Harry's argument for security too. Andrew is more at risk from the people he decided to consort with and all his shady undertakings.