I saw this and thought it was a good idea, as mentioned already though I think if you could add a bit more info it would help your cause.
For instance:
When is this taking place? Before Xmas, before New Year, in January? Later? This is the festive season and everyone has plans so I think you need to at least give a vague idea.
Do they have their own bike or will they be using a Bozza bike? And at what times, you mention commute so I assume you mean morning rush hour?
Do these drivers have any riding experience at all? Will they be able to manage a 10 mile commute for example? What sort of distance will they be comfortable with? Also I'm happy riding around Elephant and Castle roundabout and other busy spots like Old St, Euston Road, Hyde Park Corner etc, but I'd worry they'd think I was trying to terrify them on purpose if I took a total novice on such routes. But if I took take them on some real back routes away from the traffic it sounds like this may be defeating the object if you want to give them a perspective of what its like in traffic, where the lorries usually are.
I'm currently not working so don't have a commute but I'd be happy to help, as a result I am flexible and can do any route you/they want, so a bit of a cycle superhighway, embankment, central, whatever. I live in Oval/Vauxhall. Despite not working though I do have Xmas commitments and am off to Bristol for a week in January so the date is the most important factor from my perpesective.
I have not done any official cycle training but consider myself an experienced cyclist, cycle everywhere and would of course obey all the rules of the road, but I think you need to be careful with this, how will you know the person will not be a godawful liability that would give us all a bad name? Just my 2p worth, hope that helps.