Many of the EU regulations are designed to help consumers e.g. data protection.
So the EU bans toasters and kettles that work: http://www.telegraph.co.uk/news/2016/05/10/eu-to-launch-kett...
Vacuum cleaners that work: http://www.telegraph.co.uk/news/worldnews/europe/eu/11047127...
Some of the other bizarre rules...
It's illegal for bottled water makers to claim it's effective against dehydration: http://www.telegraph.co.uk/news/worldnews/europe/eu/8897662/...
They tried to ban jugs of olive oil at restaurants: http://www.telegraph.co.uk/news/worldnews/europe/eu/10064787...
A salmon smoker had to re-do all package to notify people that it contained fish: http://www.npr.org/sections/parallels/2016/05/03/476064362/b...
There's just a lot of bs. Also the common agriculture policy and common fishing policy haven't been great for the UK.
At last a free market where the curvature of the banana is subject to consumer choice.
I myself prefer the straight banana for optimizing my fruit salad.
If you don't want the EU controlling any aspect of the UK, you can't have a trade agreement.