Kevin as you will be aware each force manages their own budget and are in effect individual businesses,this is the way the Home Office and previous Governments wanted it to be.You will also know that there are economies of scale so larger forces get better deals,of course if you look at one issue such as this it is easy to isolate it and suggest savings,however the cost of the changes involved to make procurement central would outweigh the benefits not to mention the Govt rules of CCT.So your point raises a difficult question I.E. A National Police Service,no individual forces,no local accountability etc.
There are very few savings left to make,believe me and people are working in poor working conditions now,but still turn out every day and night 365 days a year,long hours,unpaid overtime,no refreshment periods etc and consistently abused by the right wing press.
Don't believe what you read,Policing is a difficult and sensitive business,not one Bobby on the ground wants to give poor service but unfortunately are being pushed down that route.
It's either pay for the service you want or don't pay and get the service you deserve.
Rant over Kevin