There are many flaws in this script but the biggest one is this: One of the key characters is an American profiler. You can smell "villain" because in general, English producers always cast American characters as the bad guys. Also, he's introduced early, which makes him a prime suspect (and he's a "least likely" villain since he's supposedly a cop).
But the "solution" reveals that he's a fake, and has been borrowing someone else's identity for YEARS. The script reveals that he has made very public appearances in the UK going back a long time. Yet we are supposed to believe that NOBODY has ever spotted the fact that his picture doesn't match his book jackets, or that he was nowhere near the right age, until one lucky cop happened to press for his autograph? Come on, Lynda La Plante, you're better than this! Either that or you're trying to tell us that Britons are brain-dead.
But the "solution" reveals that he's a fake, and has been borrowing someone else's identity for YEARS. The script reveals that he has made very public appearances in the UK going back a long time. Yet we are supposed to believe that NOBODY has ever spotted the fact that his picture doesn't match his book jackets, or that he was nowhere near the right age, until one lucky cop happened to press for his autograph? Come on, Lynda La Plante, you're better than this! Either that or you're trying to tell us that Britons are brain-dead.