I have no idea re the death figures. People are quick to mistrust the government but personally I don't see what they have to gain from knowingly and deliberately orchestrating a cover up- it's obvious that the truth would come out and the resulting lack of trust would be an enormous problem for them. It would be an incredibly short sighted thing to do and I don't think they are that stupid (others disagree, I know).
Harries mentioned a lag of one day re death figures yesterday so I suspect that could potentially account for a fair proportion given the big increase this week. I guess with the numbers increasing there must be a huge amount of work to be done ascertaining whether deaths should be attributed to the virus (and therefore be included in the figures) or not? If an 80 year old with advanced lung cancer contracts CV and dies then does he go down as a CV death or not, for example? I would imagine it's not always straightforward, particularly when a lot of those dying have comorbidities.