> MBS had ordered the assassination of journalist Jamal Khashoggi

I'm just going to add some color to this, as people may not remember. This is the Washington Post reporter that was chopped up in a Saudi embassy in Turkey.

https://en.wikipedia.org/wiki/Jamal_Khashoggi

>Despite the UK not putting MBS on the list for political reasons

Not only is Saudi Arabia a key ally in regards to Western energy resources, but Jared Kushner may have greenlit the assassination. It would put the UK at odds with the Trump administration, not just the Saudi royal family.