Why is Boris Johnson afraid of a public inquiry into Pat Finucane murder?

In a gripping drama broadcast on BBC One in June, local writer Declan Lawn re-enacted the sinister poisoning of Sergei Skripal and his daughter, Yulia, in Salisbury in March 2018 by Russian military intelligence (GRU) agents. This highly acclaimed drama bought home the sheer ruthlessness of the Russian secret service using a Soviet-era designed nerve agent, Novichok, to try to murder Skripal and Yulia.