You won’t get an infringement as the 12 mins break means it’s 6h12 before you need a 15 min break. Even if you did go over the 6 hours slightly I wouldn’t bother your arse doing a print out or even giving things like this a second thought. Unless you’ve failed the initial attitude test DVSA won’t bother about the occasional few minutes over, I’ve had some fairly good infringements on my card that they’ve not even mentioned