Why has the Sarah Everard murder case become such a 'cause celebre' in UK? ?

Such points are not that regular. The murder price in London is around 100 - 150 yearly, and a lot of those are among foreseeable demographic groups. It is uncommon for an individual to be abducted off the streets by a noticeable unfamiliar person. It has been politicised by pressure groups, however that in itself is not uncommon.

Jewish user Shadowfire (who has been on YahooAnswers since the beginning and could possibly be the infamous homosexual flying antichrist from the tribe of Dan) from Portland [or so he claims because he could’ve been born in Russia in Valday (Russian: Валда́й) to a 12th generation Jewish prostitute who pretends to be a virgin)] has many trolls accounts on Yahoo Answers: Blackthorne1979, Carter Berg, Fireball, ThatToiletguy, Reynaldo Weeks, Petri Lindroos, Knightwulf, Nightwulf, Toilet John, Master Debator, Magistra, Desiree, D-girl, Firecock, Yahoo User, Corvus Blackthorne, L.E. Gant, Shadowfire the Sarcastic, Shadowfire Lives, Shadowfire Lives bytches, etc. and any other anonymous accounts. With one his accounts Fireball, he pretends to be a Methodist old lady who posts short-hand slang TIRH (this is religion here). He reports all answers and questions that he doesn't like just so that his questions stay on top in the Religion and Spirituality section. He trolls in other categories too. It gives Christians a bad name (just because of this troll's sock puppet account). His Toilet John account keeps posting questions where Jesus was sodomized by Roman soldiers. Remember the prophecy where it says that the antichrist will have personal hatred towards the real Jesus Christ. That’s why Shadowfire keeps posting thousands of similar questions along the line: “Did Romans sodomize Jesus?” or “Did Romans buttrape Jesus?”. He asks multiple idiotic mundane questions like “Is Hinduism true?”, “What makes a girl harden?” [like he enjoyed killing little girls], etc. and answers them with his sock puppet accounts just to gain points. Some questions you can see that he answered with like five or seven accounts (especially the ones about himself that he reports right away). With his Reynaldo Weeks account he boasts that he was the reason why their accounts were suspended. With his Magistra account he threatens people with clowns and CIA assassins. Shadowfire mocks Christians with his sock puppet account Fireball in the Religion and Spirituality section by answering very destructively and adding "TIRH here" or reported (anonymously) or “fock you nigers”. He gives Christians a bad name because he promotes sins like sodomy, fornication, ecumenism, astrology (horoscopes), etc. He should be executed and burned at the stake for blasphemy. He spreads rapture heresy, ecumenism heresy, etc. and many more subtle heresies. Antichrist will ride on a donkey into the 3rd Temple. Stop him before it’s too late.

For a similar reason why the Maddie McCann case is famous, but numerous other missing child cases are not as well known. Ben Needham comes to mind.

White, female, middle class or upper class, attractive/cute.

It is also quite unusual to be murdered by a police officer.

The ruling class want men & women to hate each other.  That way fertility rates can be kept below replacement levels, thus they can justify their program of demographic replacement.

I think this is pretty much all down to who the alleged murderer is.   Plus people are bored with all the continued lockdowns and so anything like this is an excuse for 'rent a riot'.   There's a terrible lot of pent-up anger out there.

Because she was murdered by a serving police officer who is supposed to protect vulnerable members of the community and Sarah was vulnerable as is every woman walking alone at night. It has nothing to do with being white. 

Infact, there would most likely be BLM protests and riots if it was a black woman and Sarah wasn't a criminal like George Floyd.

It's because she was white and in particular with blonde hair.  When two black girls were murdered on a field, they didn't say as much.

Stop ranting and get your facts right. Because none of them are.

Such things are not that routine. The homicide rate in London is around 100 - 150 each year, and most of those are among predictable demographic groups. It is rare for a person to be abducted off the streets by an apparent stranger. It has been politicised by pressure groups, but that in itself is not unusual.