Ah, it has just been explained, The new number includes (some) care home and other place deaths. This leads to the conclusion that for the past weeks the impact of the virus on the UK has been massively downplayed. We are now third worst in the world and within a few days could overtake Italy in second place.
This looks to have been policy rather than an accounting error and come the future we re going to have to have an open public inquiry into how this whole thing has been handled.