Flipping that on its head, do you assert that there is no hypothetical situation - at all - where the UK could allow the repatriation of a Saudi citizen against their will, and be able to plausibly deny any involvement?
I don't think it is very plausible that the UK can secretly hand over an asylum seeker to the Saudis and keep it quiet, no.
I don't think it is probably that the UK would want to even if they thought there was a chance of getting away with it.