Johnny English (Rowan Atkinson) carries a Beretta 92FS Inox as his sidearm throughout the film. In the opening montage, after he gets to be a field agent, two guns (the Beretta 92FS Inox and a Walther PPK/S) can be seen put on a table for English to choose. English grabs the Beretta and poses with it in front of a mirror, and carries it subsequently for the remainder of the film. Altough every time he tries to use the gun, something goes wrong. The first time he tries to use it he accidentally drops the magazine, the second time the slide falls off forward, which shouldn't happen, and the third time he tries shoot it, feces comes oozing out of the barrel (from the sewer pipe he was in), which is not technically possible. Also when the gun doesn't fire the third time he racks the slide a few times, not sure what the problem is, but no rounds eject from the gun, meaning it's not even loaded. It is never successfully fired throughout the movie.
Glock 17
English's "sidekick" Bough (Ben Miller) carries a Glock 17 as his sidearm throughout the film. Bough's trigger discipline is excellent throughout the film, and he is clearly the more competent one of the couple.
CZ 75 "Pre-B"
Dieter Klein (Steve Nicolson), Klaus Vendetta (Douglas McFerran) and the rest of Pascal Sauvage's (John Malkovich) carry CZ 75 pistols as their sidearms. Vendetta can be seen wielding one during the attak on Queen's residence, holding his CZ on the Queen's dog. Bough (Ben Miller) can also briefly be seen handling one, after disarming on of Sauvage's thugs with English.
Walther PPK
A stainless Walther PPK is shown during the opening montage as one of Johnny English's (Rowan Atkinson) alternate choices for a sidearm. It is likely he picks the Beretta over the PPK to poke fun at the James Bond films. Pascal Sauvage (John Malkovich) also uses one at his coronation. It is later picked up by Pegasus (Tim Pigott-Smith).
One of Sauvage's thugs carries an IMI Uzi at the Queen's residence. Several of Sauvage's men can also be seen wielding Uzis at Pascal's chateau including Dieter Klein (Steve Nicolson).
Assault Rifles
Heckler & Koch G36KV
A couple of guards carry Heckler & Koch G36KVs assault rifles in the opening sequence. English describes them; "Ah, the Heckler & Koch G36, quite deadly in the right hands". These weapons are rubber props, as the flash hiders are solid and there are no vent holes in the handguards. This is logical, sibce there was no need for blank firing guns in the scene; the guards get hit in the face with them seconds later.
Unknown AK Variant
An unknown AK variant is carried by Klaus Vendetta during the crowning ceremony. He tries to use it to dispose of English, but Lorna Campbell (Natalie Imbruglia) spoils his plan. Campbell later uses it too. The gun bears close resemblance to the Norinco type 56-2 (notice the very characteristic folding stock) with what appears to be unsusual plastic furniture. It also has a strange scope (no regulation drums) and scope mount on top of the receiver.
Other
Smoke Grenade
A smoke grenade can be seen thrown by either Klein or Vendetta when English and Bough stumble upon their hiding place after they've stolen the Crown Jewels.
Walther P99
A Walther P99 is seen in the special features menu as Lorna Campbell's (Natalia Imbruglia) weapon of choice, but it is never actually in the movie itself.