We've had the same debate on my company's yammer page (a bit like facebook but for companies) and the road tax issue was brought up. lets just say they got educated. One woman was specifically vocal about it. I told her that as a citizen i pay income tax and VAT, as a cyclist i paid VAT on my bike and i insure it fully comp, and as a motorist i pay "road tax", insurance, MOT and the high fuel duty also... so as i more than pay for my fair share of road maintenance i think i'm entitled to choose the method by which i commute to work.
i also told them that if the company's cyclists all chose to cycle in one day, the company would have to find another 400 car parking spaces (they haven't got enough for everyone as it is) and next time they think a cyclist is holding them up, perhaps they would like to think about the traffic jam they would be in if every cyclist in Britain got in their car.
I also told them (and they REALLY didn't like this) that EVERYONE is free to use the road... as a cyclist, pedestrian or horse rider, but in fact, you can only drive a vehicle if you prove you are responsible and competent enough to do so and if you are proven at any point not to be responsible or competent then you can have that right removed... so therefore, by default you actually have less right to use the road than a cyclist or pedestrian, or horse rider. This of course provoked the comment "so are you saying cyclists own the road?" to which i replied... no, i'm saying everyone is entitled to use the road but you have to prove yourself worthy to drive a vehicle on it. if you have your licence removed... you're still welcome to use the road... just not in a vehicle.
so far i'm doing pretty well sticking up for the 400 cyclists in my company, but i do wish that one of the other cyclists would wade in and help me out LOL.
Also, they did ask me about my camera... it's obviously worried them. !!! they asked me what i used the footage for, i told them that personally i don't upload it all to youtube or send it to the police, its just there for evidence purposes, but that i know plenty of cyclists that do report bad drivers
I also told the woman she was free to get a bike and not pay "road tax"!