Well, made it to the TTT stage and as minipaddy didn't fancy 4hrs of driving, was able to go myself. As a result chose to go to the finish in Plumelec where I could absorb the atmosphere, without worrying about a small child getting squashed or lost, and thoroughly enjoyed it.
Passed loads of cyclists on the way there and going home, and there was a fair few hundred thousand Euros of amateur bikes lying around. Positioned myself about 200m from the finish on the last bend, (where Sky had to wait for Nicholas Roche and probably lost it), I got a pretty good view of everything and had the big screen behind me if I missed anything. The noisiest reception was for the Bretagne-Seche Environnement team, though I wish the excitable French commenattor could have taken a leaf out of the Richie Benaud book.
The comment above about the helicopters really rang true and it was especially dramatic as BMC and Sky came through at the end.
Also great comedy as the team cars kept missing the exit (carefully positioned on the exit of a blind corner) to the increasing ire of the gendarmes, who looked as though they hadn't started shaving yet.
There was a stall for campaigning for safer cycling (based on 1.5m clearance rule) where you had to complete a quiz (one for drivers, one for cyclists, one for kids and one for all road users) and you got a goody bag. A lot of people seemed to be doing it and, worryingly, quite a few were getting some of the questions wrong.
A pleasant surprise was the lack of rip off on the stalls - Merguez and Chips and a cornetto set me back all of 4 euro.
Also got clothing at the boutique at a very reasonable rate. The press van did a package similar to that you get at the book festival - goodies included tour posters, hats, wristbands, magazines and umbrellas, so the kids ended up happy. I was looking for some reading material to practice my French and this was perfect.
Thouroughly recommend the Tour experience and was very pleased with the TTT choice, as I saw action over a 2hr period. Next time, I really fancy a Mountain stage (though not Alpe d'Huez, after reading my holiday book
Thanks a lot to everyone for advice - a lot of it really rang true.