HELP!! How does one politely tell a 9 yr old to bog off?

[Poopoopeedoo]

Tricky situation. My DS8 has a class pain-in-the-neck who is basically spoilt rotten by foolish parents with way-heeey more money than sense. We had him over to stay the night on one previous occasion and I swore it would be the last! He was extremely rude, confrontational and just a general spoilt brat towards me and my DH - including melodramatically storming out of our front door when he couldn´t watch his film of choice due to the 12 yr age restriction (he watches movies like "300" at home...ahem) And he hardly knew him then, so it wasn´t a case of over-familiarity!
This was several months ago and he is now pestering my son to let him come over again or for my son to go to his house (over my dead corpse). My son is asking me what he should say to the boy and I am a bit clueless. He isn´t crazy about the kid but probably wouldn´t mind going as he has every violent videogame known to geek-kind and is allowed to do whatever he wants and stay up all night...boy heaven!!
Whatever is said will probably get back to his parents and we are stuck with them in the same class probably till they are 18, so I don´t want to cause ill feeling.
Eek...what do I tell my son to say to him that is tactful yet forceful enough to get through to a not at all bright 9 yr old??

No - it's not convenient should cover it. Repeat as often as necessary until the other boy (hopefully) stops asking.

Haha...thanks random only that´s what we have been saying for 6 months....thick AND thick-skinned this one!
And my DS is getting fed up with me as he is the one in the awkward situation at school being pestered by horrid boy!

Could u even just have him over for a few hours and take him home before bed?

"I don't want you to come to my house to play because you were so rude last time".

Children need to know the consequences of their behaviour. So what if it gets back to the parents, it is true.

Why the same class til 18??? Unlikely surely?

My mum says no.

Or you could give him a second chance and a warning when he gets there that if he messes about - straight home.

Sorry....had to hit and run there for a few hours! Kids now in bed- phew!
Sounds like the direct approach is probably the best!
I did consider the compromise of an afternoon, shocked but then I´m just encouraging the your house, then my house, then your house cycle and it´s really not a friendship I want to encourage!
Why I feel so bad and guilty about it, I know not!