A future rUK government would be far more likely to sign up to TTIP with no opt out for the NHS than an EU containing bolshy socialists is.
Any future UK government would be extremely unwise to do anything so politically unpopular as sign up to a trade deal as widely protested as TTIP universally is. Because they can be voted out. Unlike those EU Commissioners, who are in record as saying - in the words of the Commissioner responsible for negotiating TTIP - 'I do not take my mandate from the European people'.
The current government was forced to U-turn on tax credits l, forced academia action etc because they know that ultimately they are elected and if they do something unpopular enough they will not be re-elected. In our system, thus, power ultimately resides with the electorate, not the government. This is absolutely not the case with the EU's unelected government, the EU Commission, who airily admit they do not take their mandate from the European people.
As for those 'bolshy socialists', would they be the ones forcing the privatisation of Piraeus port, or insisting on austerity measures that are driving 50% youth unemployment across the southern Med?