There's something not quite right with that data and its presentation, Ollie. According to the GOV.UK
Coronavirus (COVID-19) in the UK website in the past two months there have been 4,131 COVID-19 deaths, giving a weekly average of 474 deaths, not 250.
Moreover, those categories of illness usually only account for a bit over half the deaths recorded in the UK in any given recent year. At the very least there should be a sizeable segment called "Other".
Further, heart disease looks to be significantly understated. Based on recent cause of death data for the UK ischaemic heart diseases have accounted for half as many deaths again than dementia and Alzheimer disease.
Where did you get that graphic from?