Greta had John Bolton on last night talking about this because of the Wikileaks on the story. Bolton said the US was betrayed by the UK and should’ve demanded the perp not be released, yet nothing was said. And it was done for oil.
If Mr Bolton had read a bit further he would have found cables saying that the UK government was telling the US government saying this was a matter for the Scottish government, which happens to be what they were saying in public too.
So saying the UK betrayed anyone appears to be a factual inaccuracy, especially as the current UK Prime Minister was on record at the time as being against it.