Not a SOR especially, but when oh when will Corrie characters learn that it never pays to give in to blackmail? Anna sleeps with Phelan, Carla gives Tracey whatever it is Tracey wants.. and numerous other instances with Callum, Kirsty etc, back into the mists of time.
Answer: Never, because blackmail is the sl that keeps on giving. The blackmailed character can behave completely badly and irrationally, while still having a 'reason' and keeping the audience's sympathy. Plus, there are numerous opportunities for lying to one's nearest and dearest (always a fave), complications involving other characters, blah blah de blah.
If I was a Corrie writer I'd have everyone blackmailing everybody else, pack my bags and take off for Bermuda for 6 months.