The trick is, when coming back from an EU state, is to bring in a brand which is not available in the UK and therefore unlikely to have an illicit market, which marks them out for your own consumption. There are many brands which I used to smoke half a century ago which are no longer sold in the UK but still freely available on the continent, mainly manufactured in Belgium. I prefer untipped cigarettes, common at one time but now hard to find - and - given the slow turnover - the freshness may be debatable. Whenever I go to France I fill every available space with the original Craven A cork(not filter)tipped, and have had no problem.