June Marks (Johanna Hargreaves) carries a Smith & Wesson Model 36 revolver in "My Name's Sergeant Bergerac" (S08E02). Jones (Steve McFadden) uses a nickel plated S&W Model 36 in "Roots of Evil" (S08E04). DS Jim Bergerac (John Nettles) carries a S&W Model 36 with bobbed hammer in "In Love and War" (S08E06) and "Diplomatic Incident" (S08E10). A Smith & Wesson Model 36 is the murder weapon in "All the Sad Songs" (S08E08).
When DC Ben Lomas (David Kershaw) trains on the shooting range in "In Love and War" (S08E06), he uses a Smith & Wesson Model 15 instead of his service Model 10HB.
In the hostage sequence in "In Love and War" (S08E06), Cooper (Don Crera) holds a Colt Python style revolver with 6" barrel. Then the gun is revealed to be a paintball gun, and the whole scene is a training.
Pistols
Browning Hi-Power
Smith (Struan Rodger) uses a Browning Hi-Power in "Roots of Evil" (S08E04). David Scholes (Shaun Scott) uses a Hi-Power "Type 73" in "In Love and War" (S08E06). Brian (Guy Fithen) holds a Hi-Power in the climactic scene in "The Messenger Boy" (S08E09). When he is disarmed, DS Jim Bergerac (John Nettles) picks up the pistol. The hitman Jean-Louis Clandel (Tip Tipping) uses a Hi-Power during the assassination attempt in "Diplomatic Incident" (S08E10).
Beretta 80 Series Pistol
Kevin Ramsay (Wayne Michaels) uses a pistol in the assassination attempt in "Entente Cordiale" (S08E05). This gun is seen unclear due to fast motion. It has an open top Beretta style slide, and the general appearance of the gun allows to identify it as a Beretta 80 series pistol. Beretta 84 is a decent guess as such gun is used in Season 7.
Smith & Wesson 459
Roland (Tyrone Huggins) is armed with a Smith & Wesson 459 in the climactic scene in "In Love and War" (S08E06).
Mauser C96
A Mauser C96 is used by a hitman during the assassination attempt in "Diplomatic Incident" (S08E10). According to the story, the hitman is Jean-Louis Clandel (Tip Tipping) but the character is never seen with this gun. During the investigation, a ballistic expert calls the gun "Browning 9mm" that matches the pistol, used by Clandel in another scene.
Walther PPK
Gillis (Michael Feast) holds a Walther PPK in the final scene in "Diplomatic Incident" (S08E10).
Unidentified pistol
French police Inspector Pageon (Michael Cronin) holds a pistol in the climactic scene in "Entente Cordiale" (S08E05). The gun is seen very briefly and blurry due to fast motion.
Police snipers with Ruger Mini-14 rifles with sniper scopes are seen in the final scene in "Diplomatic Incident" (S08E10).
Other Weapons
Schermuly Training Grenade
In the opening scene in "There for the Picking" a large number of hand grenades fall from the damaged box with whiskey in the port. These grenades turn out to be Schermuly Training Grenades.
Smoke Grenade
Jean-Louis Clandel (Tip Tipping) uses an unidentified smoke grenade in the scene in the hospital in "Diplomatic Incident" (S08E10).