If we have peaked this wave at around 150 daily deaths, 800 on ventilators and 6000 in hospital which may or may not be true but is what we are seeing.
THEN
That compares with the Winter wave peak before the vaccinations in mid January where we were around 1700 deaths, 4000 on ventilators and 40,000 in hospital.
AND
The first wave in Spring 2020 with around 1100 deaths, 3300 on ventilators and 22,000 in hospital.
I would suggest that infers a pretty significant degree of effectiveness.
Especially as the peak of cases between Jan and now were similar around 55 - 60K The Spring 2020 cases cannot be compared as our testing was useless and massively under reported.