Hi Timbo,
I wouldn't abandon it unless you want to. Re aimless dialoue, I think what you need to look at is the dynamics of the scene. what is revealed, what is set up, what is at stake for your characters. Here are my thoughts more specifically on your first scene - if I was script editing it this is what I would be saying to you.
4. INT. SIMON'S BEDROOM
SIMON IS IN FRONT OF THE MIRROR, BUTTONING ON A RATHER TASTELESS SHIRT. HE STRIKES A COUPLE OF POSES, DECIDES AGAINST IT, AND SELECTS ANOTHER, JUST AS NAFF, FROM A PILE ON THE BED. [ACT THIS OUT AND SEE HOW LONG IT TAKES – I.E. TOO LONG]
[SEAN (OOV)
You ready?
SIMON
Won't be a sec.]
THESE TWO LINES OF DIALOGUE DO ABSOLUTELY NOTHING SO CUT THEM.
SEAN LETS HIMSELF IN.
SEAN (TAKING IN THE SHIRTS)
Getting tarted up to see Kimmie?
[THIS SHOULD BE A FUNNY LINE]
SIMON (OBVIOUSLY LYING)
I was just trying to find one that was clean.
[SO SHOULD THIS]
SEAN MAKES HIMSELF AT HOME.
SEAN
So what's the form with this seance lark, then?
SIMON
Casual dress is perfectly acceptable. I don't think we're planning on raising royalty.
[AS HE IS GOING TO SOME TROUBLE RE HIS SHIRT, THIS SENTENCE IS A BIT OF A NON SEQUITOR]
SEAN
No, I mean like what actually happens?
[HE IS JUST REPEATING THE QUESTION]
SIMES
Well, we sit round in a circle and hold hands...
SEAN
Holding hands with Kim, eh? You going to be playing footsie an' all?
[AGAIN ANOTHER TWO LINES WITH NEITHER A SET UP AND A GAG OR A FUNNLY LINE IN AND OF ITSELF]
SIMON
...we sit round in a circle, and then Kim's Auntie Cissy, who's the medium - though meself I'd say she was the best part of a size 20 - asks if there (SPOOKY VOICE) is anybody out there? At which point some joker usually tries to get everyone going by rapping on the table. I should think tonight that's going to be you.
[CLUNKY –IS THERE A WAY OF GETTING CHARACTER BASED HUMOUR HERE]
SEAN (MOCK OFFENDED)
What me?
[IT NEEDS TO BE A LINE THAT IS FUNNY]
SIMON GIVES HIM WHAT HE IS PLEASED TO THINK IS A WITHERING LOOK.
SEAN
But come on, does anybody really answer?
SIMON
Oh yeah, Kim's uncle Percy, Cis's old man. He's her control - her spirit guide.
SEAN
Give over.
SIMON
'Course there's only Cissy can actually hear him.
SEAN (ROLLS EYES)
And this old biddy, and her invisible better half, what do they find to jaw about?
SIMON
Well, gen'rally the first thing is Perce wants to know how his pigeons are doing. He was a fancier, used to race 'em see. The way Kim tells it, he thought more of those pigeons than he did of Cissy. He was afraid that when he passed on she was going to...
SIMON PAUSES TO FIND THE RIGHT WORD.
SEAN
Neglect them?
[SEAN SHOULD HAVE THE CASSEROLE LINE AND THIS IS ALL EXPLAINING WHAT WE ARE ABOUT TO SEE NEXT SO IS ALL A BIT REDUNDANT, TRIM IT RIGHT DOWN]
SIMON
No, casserole 'em. Kim reckons that's the only reason he stays in touch - he's keeping a beady one on Cissy to see she doesn't make too free with the cook-in sauce. Anyhows, if there's a particular spook as Cis wants to have a chinwag with, old Perce rounds them up for her.
[THE CASSEROLE STUFF COMING FROM SIMON DOESN’T WORK. NOT BELIEVEABLE]
SEAN
So lets just get this straight. We're going to spend the evening round at Angie's gaff, listening to Kim's barking auntie jabbering to herself? Sounds a waste of precious drinking time to me.
[AGAIN HE IS RECAPPING WHAT HIS MATE HAS TOLD HIM THAT WE ARE ABOUT TO WATCH ANYWAY]
SIMON
The Wheelbarrow can survive an evening without your custom. Might need to reschedule the mortgage payments, but, hey! Hows about Angela? You infected her with your cynicism?
[THERE IS NO REAL BRIDGE BETWEEN THE THO ELEMENTS OF THIS CHUNK. AND IF THERE IS A GAG ABOUT MORTGAGE PAYMENTS IT NEEDS TO BE POLISHED UP]
SEAN
She's well up for it. Kim's got her freaked out at the idea of this horny old dear departed clocking all her naughty bits. Won't let me lay a finger on her in the flat.
[AHAH SOME PLOT! WHY NOT PUT THIS RIGHT AT THE BEGINNING AND MOTIVATE THE WHOLE DIALOGUE RE SUPERNATURAL STUFF – AS IT IS THE KEY TO BOTH THEIR LOVE LIVES WE CAN NOW SEE]
SIMON
So his afterlife is putting the kybosh on your lovelife?
[AGAIN I WOULD GIVE SEAN THIS LINE, BUT POLISH IT]
SEAN
That's about the strength of it. The daft mare won't take a shower without wearing her swimming cossie.
[DAFT MARE IN THIS SOUNDS ODD, AND THERE SHOULD BE AN EVEN AND A NOW IN THERE AT THE LEAST]
SIMON
You can see it from the stiff's point of view though. I mean, if you're a disembodied spirit it beats hanging out round the boneyard.
[AGAIN THIS COULD BE WORKED INTO MORE OF AN OPPORTUNITY FOR THE AUDIENCE TO LAUGH]
SEAN
Well, yeah - but you could do better. Me, I'd be haunting the ladies changing rooms at the All England Club. All them lezzie tennis starlets. Phwoar!
[BUT ISN’ THIS WOMAN THE OBJECT OF HIS AMOROUS AFFECTIONS? ]
SIMON (LAUGHING)
Dirty sod. (PULLING ON HIS JACKET) We set then?
SEAN
I reckon. Let's go raise the dead.
THEY GO OUT THE DOOR. A MOMENT LATER SIMON COMES BACK IN AGAIN TO CHECK HIS APPEARANCE IN THE MIRROR. SEAN GRABS HIS ARM AND DRAGS HIM BACK OUT AGAIN.
[NOT A STRONG ENOUGH ENDING TO THE SCENE – EITHER A FUNNY GAG OR A FUNNIER VISUAL I THINK]
I think all the elements are there in the scene you just need to make tthem more organic. Concentrate on the motives of the characters and I think that will help.