Novelist research: typical celeb hire-aircraft

[FNG]

I am helping a writer friend with some aviation details. The characters in his novel, who have bundles of cash but are not Div 1 super-rich, fly to London from Paris for dinner and back again. I have suggested to him that they might fly from Le Bourget and land at Celeb Heathrow aka RAF Northolt, but what would they hire to be flown in? I know zip about twins and such. Maybe a Citation, but I am thinking that a propeller driven aircraft might be more likely. Are things like Cessna 340s and 414s old hat?

Thanks for your help.