I saw pretty much all of it between trips to the kitchen to sort dinner out (how domesticated am I

).
As you said 1) won't get affected much, but probably slightly better off. 2) very likely to be better off if they travel after the rush hour (as if no one would have guessed

), but WTH was the point of only doing the calculations for a small part of their motoring? Are we supposed to believe that the only mileage the car does is to tow the caravan, which naturally doesn't do their fuel economy any favours. So they may be better off on the caravan trips by a two or three hundred quid, but depending on where they work and shop that saving could easily get eaten up, and some. 3) was the shocker, since he was the sort of bloke mant can identify with. He's got the rush hour commute to deal with like most people, and he doesn't have much choice about what time he goes to work. They worked out his annual motoring costs as a little over £3000. Best case (ie fuel duty scrapped entirely) he was about two grand a year worse off, middle case (fuel duty halved) slightly over £3000 worse off, and worst case (road charging
and fuel duty at current levels) his cost would more than double to over £7000 making him 4 grand worse off.
Talking heads were mildly amusing. Alastair Darling was on telling the journo bloke how wonderful it would be without actually answering many questions. Bloke from Trainspot 2000 was on with the usual stuff about traffic expanding to fill the available roadspace, though he did echo the point about drivers diverting onto cheaper roads which might be less able to cope safely with the traffic. Quentin Wilson was on, and to be honest was rather disappointing. Although he did defend car use and pointed out some of the reasons why we choose cars over public transport so often, he also made the sort of "the problem's not going away, something must be done, we can't all continue to use our cars" noises I expected from the T2K guy.

Cheers Quentin.

Still, he did say that public transport simply isn't an attaractive alternative and needs to be sorted out before attacking drivers.
No one as far as I saw brought up some key points about congestion. Firstly that congestion will not increase indefinitely unless we learn how to drive two cars simultaneously in the future. Next, that congestion can sometimes be down to stupid policies and bad design. And the biggie that wasn't mentioned, that congestion can be its own regulator because people choose other routes anyway when the jams get too bad. With no mention, let alone discussion, of these the show was little more than an interesting numbers exercise to see how much more (or less) a few people might be under per mile charging using some assumptions and hypothetical numbers that no one in power has yet committed to.