Don't put words in my mouth. No, I think that UK citizens, both police and others should have right to efficient self-defence. Despite what you might think, UK is not some safe paradise, it has significantly higher levels of violent crime than many other European countries that don't have such draconian laws. Currently criminals are committing knife attacks with impunity[0] and law abiding citizens are left defenceless.
others should have right to efficient self-defence
Interestingly the justification for carrying knives is often self-defence.
The crime figures have been falling in the UK for a long time. There has been a small uptick in knife crime, probably associated with falling police numbers (20,000 less) since the financial crisis.
So you think the UK police should kill more people?