Lol course they do they didn't grow up in a welfare state. Once they work out the welfare state their "work ethic" will be the same as that of non-third worlders. Their children will likely have the same "work ethic" as english children. Unemployment is higher amongst descendants of immigrants than the english people they are coming "to do the jobs for".
Unlike in this country, education is not a right, but rather a privilege. If a family works very hard just to send their child to school to get a basic education, I think that child would at least be expected to make an effort.
if you mean in education, well the alternative for many people to getting good grades, and a good degree and therefore a good job would be to be a labourer, and since labourers can get laid off, I'd say without education in a country with a low income per capita there's a high chance you'd be living in abject poverty. Certainly living conditions would be much worse in general than in the UK or other 1st world nations.
I think it's pretty difficult to judge their work ethic given their situation.
In the western world, most people work to improve their lives, and be able to afford nicer things. Very few actually work to stay alive, as the welfare system is enough for them to not have to worry about mere existence.
For many in the third world, the choice is much simpler: work hard or die. The true test of work ethic only comes when work is not a prerequisite for staying alive. Until then, we can only assume that the people who live there are exactly the same as us: a mixed bunch, some of whom are lazy, some of whom are hard-working.
i dont think they have much of a choice to be honest they cant afford to get by, by doing the bare minimum they have no safety net like we do and theres a **** load more of them than us so competition is far steeper.