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'Who Dares Wins' (1982) aka 'The Final Option'
Lewis Collins is a captain in the SAS who resigns his commission after an elaborate set up so he can go undercover to infiltrate a terrorist cell.
One of those films that has its moments but could have been a whole lot better without a lot more effort. With Lewis Collins in the lead role it does look and feel a lot like an extended episode of 'The Professionals' and indeed director Ian Sharp also did a number of episodes of that TV series.
The two main problems are that the pacing is ragged, firstly you get the impression that they had to drag out boring scenes in order to get the run time up to feature film length. Example being the rock concert scene, do we really have to sit through the entirety of the crappy song the band is playing?
Secondly the terrorists are not at all threatening or scary, they look like some genteel middle-class blokes from down the pub and their cause and motivation simply isn't credible.
So after a promising start it all gets a bit bogged-down and crappy, even the mostly very good cast can't save it.
Really only worth a look for the final third where the embassy is taken over and the SAS have to go in since it is actually the real SAS on screen, not actors or stuntmen.
Collins passed selection for 21 SAS (a territorial regiment) but was declined for active service on the grounds that he was too famous.
Just watch the first fifteen minutes and the last fifteen minutes and you've pretty much covered everything worth seeing.