Thanks for all your replies so far, much obliged...
Let me put it another way, going back to our A320, lowish GW, all other factors being favourable, what's a ballpark minimum length you could stop it in? Reversers on coming over the fence, max braking, wing and prayer, that sort of thing....!
I've flown a full-size 737 sim where we tried to land at Barton!!! I got it in - I'm not too sure how you'd get it out again though...