tldr:
isthequeendead.uk is/was a parody site which suggested the queen was “probably” dead and had been replaced with a robot; it is/was complemented by isthekingdead.uk.
istheskivillageonfire.com?
The Sheffield Ski Village is/was a synthetic ski sloped that, after closing, was so frequently set on fire by vandals that it was no longer newsworthy, so someone else created https://istheskivillageonfire.com, which said “Probably”.
isthequeendead.uk?
https://isthequeendead.uk paid homage to this website by posing the question “Is the queen dead?” and answering “Probably”, followed by a “My Family” style doodle depicting the queen as a robot (a reference to the historic joke that the queen’s mother had lived so long she’d probably been replaced by a robot). Following the queen’s death, the site was updated to answer “Yes”.

isthekingdead.uk?
https://isthekingdead.uk continues the tradition of parody by drawing on increasing anti-monarchy rhetoric and answering the question “is the king dead?” with the answer “Hopefully”, depicting the king with a big-eared sausage-fingered caricature in the same style as before.

why?
I respected the queen but did not respect the role; I do not need a king, and I did not like how the mainstream media suggested we could not parody the royal family and risk hurting anyone’s feelings.