Of course statistics can be manipulated, but I doubt if even the government would dare to cover up registered deaths, although some deaths where Covid-19 was a major contributor factor might not necessarily have it on the death certificate.
The UK is testing less than Germany, so the percentage of deaths would appear higher. The UK just doesn't know how many people have been infected and are infected now.
The rate of death is still following a regular exponential curve with the number of deaths doubling every 2 or 3 days. If it carries on at this rate, there will have been 18,816 deaths in 9 days time. That's probably an underestimate because deaths at home aren't yet being recorded.
It should begin to slow down in about 3 weeks because, by then, the majority of the country will have been infected, assuming the percentage of those who will die is about 1%.