The entire enterprise seems to be to narrow a wide road to aggravate drivers and perhaps slow them down.
There can be no other explanation; if the cars were “normally” parked in a parallel fashion to the pavement, there would be just as many cars parked, but the road would be much wider for cars and vans driving past.
Consider the diagram above. Fig 1 shows the current angled parking. Fig 2 shows normal parallel parking, and the top figure shows both combined. Hopefully, this diagram shows that the cars take up the same length of kerb regardless of the angle of parking. The only difference is how much car is sticking out into the road.
Not only does this restrict a perfectly wide road, but it creates a couple of new dangers: cars parking in like this often touch the very high kerbs at the offside bumper, and parked cars have to reverse into oncoming traffic to leave the parking space.
Each bay is a pay-and-display earner for the council. It would make no financial difference whatsoever to change the angled bays back to normal parallel ones. It would widen the road for vans, improve road safety and reduce bumper scrapes for car owners in icy conditions.
However, common sense does not prevail in councils, and so the people who have to suffer are the ordinary tax-payers.