They just kill them. Here, we give them Guardian columns or make them senior members of the Labour Party.
He was exchanged though, no? What sort of absolute cad returns for revenge upon an exchanged prisoner? Surely he should be considered hors de combat?
One also wonders quite how effective his new identity and cover was. Not very, would be the obvious answer. Bit of a balls up by SIS, really.
Meh
The North Korean airport hit was better imo
How about that billionaire couple in Canada...straight up execution that won.