Some very good points here Snazy.
Speed cushions are at best pointless and at worst dangerous.

They are the political compromise position between proper road width humps and nothing at all. And so achieve nothing.

I quite like proper road humps, but they are not effective against station wagons, and slow up emergency vehicles.

I also like speed cameras, but public opinion is so set against them, probably because they work. But I guess there are legitimate privacy concerns.

I'd be curious to know how well the smillie neon face as works on Perry Rise. I admit I am sceptical, but it gives positive reinforcement to good drivers, and publicly shames the speeders.
At the very least, hopefully it records the numbers of speeders and the range of speeds so the police know the extent of the problem.