Actually I never heard about this TV show and the OP never said from which episode the screen caps were, so I put on my detective cap and did a bit of Google-Fu to search for a match of one of the images with no luck; I got the same result by searching for The Sweeney flare gun. Then I tried with The Sweeney shotgun and this led me to this site ==> IAN HENDRY & JILL TOWNSEND CHRISTEN 'THE SWEENEY: RINGER'. Then I searched for that particular episode and took some screen shots with the flare gun.