You can download the leaflet here:
http://customs.hmrc.gov.uk/channelsPortalWebApp/channelsPortalWebApp.portal?_nfpb=true&_pageLabel=pageImport_ShowContent&id=HMCE_PROD_010821&propertyType=document
There has been no limit for ages now (certain EU countries still may have limits, Estonia, Latvia etc.), though others will go on about a Spanish law.
For gifts, it has to be a gift and NOT for payment in kind, though how they know beats me!!!!
It's not a crime to bring in more than 16 sleeves of cigarettes, just a crime to sell them - if caught obviously.
These price increases along with the poor £/€ rate will make it less lucrative to smuggle for finacial gain.
Robby