I remember one flight from Dalaman into Gatwick where everyone was stopped and most were searched - there was a line of customs guys standing between the carousel and the nothing to declare exit and if you said Dalaman when they asked you what flight you just arrived on, you were taken aside - it was choas.
Having found nothing of interest in my case (I used to travel to the UK as light as possible so I could return cheese and pork laden) the cheeky sod asked me what the purpose of my visit to the UK was! I said for an exhibition and would you believe he then asked "How long do you intend staying in the United Kingdom?" to which my answer was to be "I'm born and bred British, I can stay here as long as I like you jumped up little prick", but for some reason it came out as "Only till Tuesday"!!!
There were some amazing scenes in that customs area though - emptied suitcases with an exact suitcase size pile of cigarette cartons next to them, suitcases being emptied that were entirely full of polo shirts, T shirts, and another thing they love to find - cash.
If there is/was a list of flight origins to target for counterfeit goods, I can assure you Dalaman is on it.