Looking at most of those Police Camera Action type programmes it has always appeared to me that the only crooks chased by police helicopters are car thieves and minor villains who always escape jail.
Cost to success ratio does not appear too good.
I have never understood why the police get involved with stolen vehicles.
Insurance pays out and there is less risk to the public with no chase.
In places like Wales and Norfolk the rural crime rate is so low there is no justification for a helicopter.
I'm sure every chief constable would like us all fingerprinted and on DNA database along with 24/7 surveilance