I posted links to Prof Dougan twice, too. (perhaps 3x = spam?)
I liked the video a lot too (but I would like it as an academic). I didn't understand every word, I'm not a lawyer or business person either.
Especially good when he explained that tariffs were irrelevant & the true hurdle to free trade is compromises in regulatory frameworks; this is why the EU has so many "petty" rules and regulations. I suddenly saw value of all that. Also the explanation of how EU decision making follows consensus and power of "the Big 3".
His description of how the UK cleverly piggybacks leverage b/c of access to the single market was good, too. That fits with me understanding how we are mostly a service economy rather than manufacturers/growers.
Consensus as main style of political decision making is so alien to UK, I guess that's why folk hate it.
Seems to me like most the controversy in TTIP is about aligning regulatory frameworks, too. That's why TTIP is stalling.
Dougan is the exact type of guy UK will need to negotiate half-decent trade deals, post-Brexit. I don't think there are enough guys like him available. :(