I think you're right about the restrictions of the car-bound format. Not entirely sure how best to get round that, although I reckon if I keep up the theme of each "lesson" actually revolving round an errand of Barry's I could get the pair of them out of the car a lot.
Here's how it ends...
INT. BARRY’S CAR - DAY
Barry and Tom drive on.
TOM
Mum told me you’d retired.
BARRY
I was considering it, yeah.
TOM
Why?
BARRY
Oh, well, I had a bit of an incident. A prang, shall we say.
TOM
You had an accident?
BARRY
It happens to the best of us, dunnit?
TOM
Was it serious?
BARRY
I would describe it as fifty percent non-fatal.
TOM
My God, you killed someone? On the road?
BARRY
I think technically it was more pavement, but yeah, adjacent to the road, definitely.
TOM
Shit.
BARRY
Yeah, I felt bloody awful, I mean you can imagine.
TOM
You killed a man.
BARRY
People don’t kill people, Tim, cars kill people. I was practically an innocent bystander. Should have got rid of the car, really. I mean, it had tasted blood. That’s why, well, this is pretty important to me, Tim. You know, I think that’s why your mum, my sister, she asked me to teach you to drive. It’s my shot at redemption, innit? You know, you and me, we’re family, I’ll teach you to drive and you, you’ll teach me to live again.
Tom is quite overcome by the emotion of the moment.
TOM
Wow, Uncle Barry, that’s really...
SFX: A digital watch’s alarm going off.
BARRY
Time’s up, stop the car.
Barry looks at his watch and switches the alarm off.
TOM
What?
BARRY
Stop the car, that’s your hour over.
TOM
Oh, right, ok.
Tom pulls the car over to the side of the road and parks. He gets out.
Barry scooches across from the passenger seat to the driver’s seat while Tom walks around the outside of the car.
He places the goldfish bowl on the passenger seat and puts the seatbelt around it.
Just as Tom reaches the passenger door, Barry reaches over and locks it. Tom looks puzzled. He knocks on the window. Barry leans over and winds the window halfway down.
BARRY
Yeah?
TOM
Let me in.
BARRY
Sorry mate, no can do.
TOM
Seriously Barry, let me in.
BARRY
I wish I could, Tim, I wish I could. It’s the rules, see. I cannot be seen to be fraternizing with my pupils out of office hours. The DVLA would be on me quick as a fat bird on a ham sandwich.
TOM
But, what you were just saying, we’re family.
BARRY
Shhh! That’ll be our little secret.
TOM
Barry, stop messing about.
BARRY
I’d love to stay and chat but I’m off duty, you understand.
Barry starts winds the window up.
TOM
Wait, what if I pay for another lesson?
Barry stops winding the window up.
BARRY
Go on?
TOM
Well, if I pay for another lesson, I could get back in the car, right, and we could drive back into town.
Barry sucks his teeth.
BARRY
Well, yeah, I suppose that could work, technically, yeah, why not? Have you got twenty five pounds?
TOM
What? No. But wait, I lent you twenty pounds just now, didn’t I?
BARRY
Yeah, yeah you did.
TOM
Well?
They stare at each other for an awkward moment.
TOM (cont’d)
So, maybe that could go towards a lesson?
BARRY
What? You’re asking to start up a slate? Tim, we might be family, but don’t take the piss, mate. It’s a bit insulting. I’m going to let it go this once for your mother’s sake. F**king hell, your generation, I don’t know.
Barry winds the window up again. Tom is stunned.
Barry starts the car and drives off. We see Tom, looking bewildered, receding in the rear window.
SFX: The orchestral main theme from Jaws, but very tinny.
Gifford puts a hands-free earpiece in. The music stops.
BARRY (cont’d)
Barry Gifford. Wotcher Cheryl. Yeah, he’s just on his way home now. I think he’s learned a lot, yeah. What, another one? You don’t ask for much, do you? No, no, you’re family. I’d have to check my schedule, though, hang on.
There is a pause as he just keeps driving.
BARRY (cont’d)
I’ve had a look, how’s next Tuesday sound? Yeah, I got a little errand to run that morning but I’m sure we can work around it. I’ll see him then.
He rings off.
BARRY (cont’d)
(singing)
Farewell and adieu to you fair Spanish ladies, farewell and adieu to you ladies of Spain...
EXT. DVLA TEST CENTRE CAR PARK - LATER
Barry’s car pulls in, and he gets out.
Van Cleef and Sophia are there, leaning against their respective cars.
VAN CLEEF
Well I’ll be danged, looks like he lost another one.
BARRY
I haven’t lost anything. It’s all part of the patented Gifford system, my holistic approach to tuition. He thinks he’s just walking home, like Ralph Macchio thought he was just painting a fence, then bang! He twats the arse-chinned bloke out of Cagney and Lacey right in the noodle with an unexpected bird-related manoeuvre. And that’s my philosophy, innit? Maybe you two ought to be writing this down.
VAN CLEEF
You’ve got some cojones, Gifford.
BARRY
I got balls like weather balloons, mate, don’t you worry about me.
INT. BARRY GIFFORD’S LIVING ROOM - NIGHT
Close on a piece of paper on which Barry is writing the name "Van Cleef".
Pull back to reveal the paper is stuck to Barry’s wall. It is headed with the title "Barry’s List", and there are a lot of names on it, many of which have been crossed out.
Next to it is another list headed "Christmas cards". There are only two names on it.
Barry, back in his shirt/underpants combo, walks to the record player. The goldfish bowl containing Chief Brody now sits next to it. He pulls the switch that starts the turntable spinning, and goes to sit down.
Barry sits in his armchair, scratching his balls and staring at the cut-in-half photo of himself.
The record player starts playing the half-a-Phil-Collins record:
RECORD PLAYER
Oh if she called me I’d be there, I’d come running shkkkkkkkkkkkkk (the sound of the needle on the bare turntable) KLIK all my life I feel so good if I just say the shkkkkkkkkkkkkk KLIK Oh sussudio, su, su, shkkkkkkkkkkkkk KLIK
END.