That was taken from an interview in the days after the Jean Charles de Menezes shooting, an incident that lead to a complete review of Operation Kratos. The summary of the interview is misleading in many way, not least of which because the call to take a Critical Shot is not one for the Prime Minister to make.
Surveillance technology requires monitoring. The proliferation of city centre CCTV requires 24/7 manned centres and generates more incidents to be investigated. And technology has benefited both sides of crime - mobile phones, secure encrypted messenger apps, faster/bigger internet, anonymous currencies. The role of policing is more complex in a more complex world.
See
https://www.gov.uk/government/uploa...le/586508/police-workforce-sep16-hosb0217.pdf and
https://fullfact.org/wp-content/uploads/2015/09/RP01-28.pdf#page=10
Numbers relate to England and Wales only
2016 - 122,859 police officers
1979 - 110,000 police officers
(what I also find as worrying is that the average age of police officers is increasing - this is a problem for any sufficiently large workforce)
We're not just heading back towards pre-9/11 policing levels, the next round of cuts is taking us back to the days of John Thaw in
The Sweeney. And since the '70s the population has grown, the road network has grown, and the threat level from terrorism is dramatically different.
You compare the IRA threat to the Wahhabist terrorist threat, but when the PIRA bombed Manchester in 1996 they gave a 90 minute phone warning and there were no fatalities.