I personally haven't met any economic migrants, but I suspect there are some in the camp. I am a realistic person. However every single person I have spoken to has fled war, bombings, ISIS, Taliban, (with all of the beheadings, chemical warfare etc that has been going on). In what I say below, please bear in mind that I have no capacity to speak officially because I'm not official, my impressions written below are mostly subjective.
My experience is that in descending order (it may be a little out) is that the distribution of nationalities is as follows:
Afghans - all those I've spoken to have fled because of the Taliban
Sudanese - Every single one I've spoken to is from Darfur where all of course know there is an ongoing genocide. I also have to say that these are the kindest most gentle people I have ever met.
Kurdish Iraqis. - Many of these people fought on our side in the Iraq war. These people are absolutely not safe to remain in Iraq. In danger from both ISIS and the Taliban.
Syrians - These are increasing in number and I have no doubt that they will increase further as Spring arrives. There is obviously no disputing that these are refugees.
Then in much smaller number I have met:
Eritreans - they have had a brutal ongoing civil war.
Pakistanis - I was really puzzled as to why they are there, until I got talking to one recently. His brother had been killed by the Taliban - his parents sent him away to be safe, they have no intention of joining him as it seems that the young men are at most risk.
I will repeat the reasons why some out of the very many refugees there are in Europe would like to go to the UK are one or a combination of the following:
1)They have friends or family who can support them - the asylum process takes a long time.
2)They speak English - easier to resettle if you speak the language
3)They have friends who have applied for asylum in France, not been given any housing, so still remain homeless then several months later are deported. France has one of the worst asylum acceptance records in Europe for some nationalities
4)Many of them believe the UK is somewhere where they would be treated fairly, even if our government is not welcoming. When you see how they are treated in France, with much rightwing violence and the way they have been treated by the French police you would understand why they hope things will be better else. There is a huge historical aspect to this belief too. We spend a lot of time telling them that things won't be better in the UK. None of us want to see them risking lives to try and cross to somewhere that probably won't be any better.
I was told that the definition of a child for the purpose of the census was 15 and under. Yes there are older teens there too, but honestly, when you talk to them they sound just like our kids - first love is football and video games, they miss school, their friends and of course their family. Parents pay people smugglers to stuff thechildren into the boots of cars. Not so they can join them, but just like we did in World War 2 (only we had safe and legal ways to do it) to get them to safety away from horror.
I constantly double check myself - am I helping or am I harming? I truly believe that they are not crossing the seas in little dinghys, walking for weeks or months, just because we are helping them with the most basic of basics. Because there are many smaller camps where there is little to no help, yet still many stay in those and instead they go hungry, stay cold, have no access to medical or legal help. If you saw Dunkirk where there are around 3000 people, mostly Kurdish Iraqis, where there is so very very little help in there in comparison to Calais you would see that it isn't aid that keeps them there, it is hope and desperation. A strange mix really.
I do feel slightly frustrated that people are missing the point that even if we could persuade people to move from the Jungle into French supplied spaces there are still nowhere near enough. There are around 130 spaces left in the containers.