Re: lying cop
even going so far as to fine one of them for lying in his statements
If that cop lied he should have been sacked and lost his pension. The police are given certain privileges and powers so that they can do their job. If they abuse them then they show themselves not trustable to use them and so should no longer be allowed to use them ... which means that they cannot do their job ... which means that they get sacked.
Lose his pension: reduce the temptation to finger some innocent sod as a way of getting an easy conviction to meet their targets.
The same penalties should apply to those at GCHQ/... and their bosses: home secretaries and prime ministers.