@picklemewalnuts - I understand your question. This is a statistical answer, so sorry if it feels a bit blunt...
In very basic terms, if 1% of the population (say 600,000) were expected to die in the UK without any pandemic, and CV independently leads to the death of 1% of the population (a potentially different 600,000) then 1% of those CV deaths, that is 6,000 deaths, would be of those who would have died anyway.
However, mortality from CV and mortality from other causes is unlikely to be independent, ie a much higher proportion of the CV deaths would be among those who old or otherwise vulnerable, and more likely to die anyway.
In my line of work (actuary), if we do see a big spike in deaths especially among the elderly in the next few months, we might anticipate lower numbers over the medium term (next few years) among that part of the population - because to some extent CV has accelerated their deaths which (on average) were expected to occur anyway in the next few years.