Kidnapping Brenda - how bizarre - and what would the 'ransom' be - not 500 kg of Tom Archer Sausages, nor 1000 pints of milk, so why, actually would anyone ransom her ?
If it was CSI, she'd turn out to have been working on the sly in Birmingham (not Leicester where she said she was) as a wicked Dominatrix and have a little black book, with Matt, some MPs, and Brian listed, but this is blasted Ambridge for goodness sake :)
She'd disguise her voice, tell them to kneel and give some nasty lashes with a whip to their back and legs and just signify "zipped lips" if they said anything so they'd know to shut up or get a severe whipping!
Can think of all sorts of nastiness for Matt on the wrong end of a strap-on, and Brenda wearing stilettos to stamp on Brian's privates (they're the only two from Ambridge who go off at regular intervals for "business" meetings, so could easily have managed to get away when Brenda was out of the village)
Of course they didn't know that it was Brenda behind the fancy mask, feather head-dress, and would not recognise her with such a tight waist in her corset, with boobs almost spilling out! She could take hundreds in cash fro those two alone, and has a secret deposit account Tom knows nothing about, so she can depart to a life in a luxury penthouse with a few naughty male clients paying her for their kicks, but not getting any sex at all...