3 million of blissfully and deliberately ignorant individuals who won't adapt their social behavior to avoid viral spread is more than enough to overrun any health system.
It's not the ultra orthodox who really stand out. There's about 30% in the general 20-29 groups who haven't taken their shots (going down to about 20% in 30-39 and down to 10% in the 60+ group), and many Arabs who are reluctant to do so too.
The original spring 2020 outbreak in the UK was huge, affecting a sizable percentage of the population. However at that time PCR testing was nowhere near scaled up to the point that all of these cases could be tested.
Therefore if you were infected in the first wave, recovered, and are now reinfected 16 months later you probably aren't going to be one of those 137 because it's quite unlikely you were PCR tested the first time around.
That's not to say reinfection is super-common either, but it's probably at least an order of magnitude (or possibly even two) more common than that raw percentage would suggest. In other words, you've produced a statistic with zero significant figures of accuracy.