Roughly the last 10 minutes was:
Flashback to the girl you think is Amy meeting Sean in the dark. It's Mary. Sean tells her about the win. She is strangely drawn to him.
Then we're in the kitchen again. Everyone seems to accept that Sean has nothing to do with Amy's disappearance. Sean says he's going to take Mary to the airport. She angrily accuses him of wanting the other girl (can't remember her name) over her.
Sean gives Mary a cheque to settle a debt and £10,000 extra and tells her to go back to her boyfriend and their baby. The boyfriend has had an accident on a building site and is probably quadriplegic. Fuck my boyfriend, says Mary. He should have held on to the scaffolding tighter. I want you, Sean. He says he'll always love her, but it's not to be 
Sean goes with Mary to the airport in the cab. I'd probably want to make sure she got on the plane too. Why doesn't she get the train? Surely it would be easier?
The syndicate is due to meet Baron Hardup to discuss the deal to buy into the stately pile. Lenny Henry pootles by in a brand new tractor. Parp, parp.
Girl whose name I've forgotten takes the ribbon from her hair, shakes it loose and lets it fall. She smiles indulgently at Lenny, who appears to be channelling his namesake from Of Mice And Men. She seems not to be angry that he's lashed out about as much as her mum wanted to spend on a new kitchen without asking anyone and not to remember that she told her mum off for that.
Baron Hardup and his evil wife and feckless stepson are discussing where the paintings are. And the Bentley and the Ming vases.
Feckless stepson said they were hard-headed business decisions and Baron Hardup was too senile to drive anyway. He is goading Baron Hardup into another stroke. Baron Hardup bashes the table with his ivory-topped walking stick and tells FS that he'd give him a damn good thrashing if he had the strength then he sinks back in the chair, exhausted by the effort of acting.
Comedy simpleton Lenny Henry saves the day by knocking on the door and talking amusingly about his 'condition'. He needs to remind us of this because he's wearing a suit that still fits even though he says he got it when he was 20, and not the funny hat that marks him out as a comedy simpleton. Passim Benny from Crossroads. He witters on charmingly about his plans to do up the gardens to Lady Evil who looks like she thinks the eugenicist movement of the '30s had a point.
Feckless Stepson scoffs and gargles more of Baron Hardup's scotch from the crystal decanter that's probably worth a few bob.
Cook mum hands round a family-sized bag of crisps and a couple of bottles of Pinot Grigio along with brochures for the new kitchen. She talks about her big plans for a cookery school that'll bring in millions, I tells ya.
She passes a package to Amy's mum that has come for her in the post in a casual manner that says to everyone: This Will Obviously Be Significant.
Distraught mum weirdly doesn't open the package but receives a call and a picture of Amy. But that damned place doesn't have a signal so it conks out.
Feckless Stepson suggests that she's imagined it all because she was overwrought and working class. He is very insensitive.
He mentions that his American friends have come in with a higher offer. The Syndicate are devastated.
Sean walks in. He and Girl Whose Name I've Forgotten exchange goofy looks. Baron Hardup says he's sticking with their offer. Sean and Girl arrange to meet for a date. She is unperturbed by his past as a sex offender.
The police arrive and DI Wonderwoman wants to speak importantly to Amy's mum. Amy's mum finally gets round to opening the package. It contains a huge photo of an unconscious Amy with the kind of graze of the cheekbone that is TV shorthand for Kind Of Sexy Beating Up Of Women.
Lenny helpfully points out to anyone who hasn't noticed that Amy is hurt. There is a ransom demand for £1 million and an instruction not to tell the rozzers.
Amy's mum collapses. Baron Hardup calls for smelling salts. Yes, he really does. Who in the past 120 years has had smelling salts handy?
Lenny mentions the photo but Amy's mum doesn't want to show it to DI Wonderwoman in case it fucks up the deal with the kidnappers.
Cook slyly kicks her handbag over it. Amy's mum mutters 'nothing, nothing' to DI Wonderwoman, who takes this bizarre scenario at face value.
She reveals that they've found Amy's horrible boyfriend. Da, da, daaaa!
I like it.