Who's panicking? David Cameron didn't impress much EU leaders with his 'Juncker or me' threat, did he.
You can't be part of a team and then continuously stall or block it for personal/national interest. it's give and take.
And please don't think the UK is the only country suffering from excessive migration, we all have our migration problems and it would be very naive to think they will suddenly disappear by abolishing the EU.
You're right, it makes completely sense to allow drivers from other countries on your roads and then have different rules and signs.
It's also correct that you'd better not regulate the production of chemicals. Who cares what they put in it or that it is produced by 10 year olds?