Looks fine to me. In an ideal situation I try and find a gap where I can slot fully in between cars. You can't always do this, and sometimes you need to sit just to the front side of the car. If I do this I will always have a look back at the driver to make sure they have seen me and know what I am doing. That way I also get an idea if they will let me in or not. If they won't then I grump a wee bit and slot in behind them. No great loss, and no great harm to anyone.
I'd quite happily do that too. Would probably try to fit fully into a bigger gap even if that meant stopping a few cars short of the junction but if no such gap presents itself you can slip in like that quite happily. As Mags said, get eye contact and wave thanks if you can.
I probably would have tucked infront of that big black 4 x 4 as it was a nice big gap. Not keen on going all the way to the front as you then have to try and tuck in at the junction where it's more dangerous trying to get around the cars.
Jo - Dosen't have any memory on board... not really an issue as the microsd's they use are about 5 quid for 2Gb.. hardly bank-breaking. Other than that, it occasionally breaks the avi file 1 out of 50 times approx).. you can still view the file absolutely fine, but can't pull it into windows movie maker...