The Sweeney 4: Regan and the Lebanese Shipment by Joe Balham
Another Sweeney novel and this time Jack is back in London at last, though some of the villains come from abroad (the novel's title will give you a clue where). Its a gritty tale of London gangland violence and treachery.
Jack Regan is still the loner, his relationship with George Carter is as adversarial as his with his superiors so its not quite the same Jack as in the TV series but getting closer. The story is fairly engaging and has all the familiar elements to a Sweeney story: grim villains, posh nobs, ultra violence and useless interfering bosses. So put your trousers on and get reading.