If they fled in genuine fear of their lives, why not ask for refuge in Italy or France? Aren't Italy and France safe
By the same token, if you've fled your country and travelled thousands of miles at great personal risk, why wouldn't you go a little further if you're in the minority who see Britain as the best option? If you believed - rightly or wrongly - that you had a better chance of being successful, both in your asylum claim and in the long-term, in the UK? I'm just not quite sure the psychology is automatically 'fled country = will apply for asylum in the first safe place.'
I've been trying to find out more about this but there's not much about. Interesting video on the Guardian (gasp!) website of Syrians at Calais citing being English speaking as the reason they wanted to apply for asylum in Britain, not France or Germany.
I found this on a humanitarian website (so not without bias, but sadly without source):
When asked this question, the main reasons cited by migrants are:
They have family and friends in the UK.
They speak English.
They face racism in Italy and France.
There are more jobs in the UK.
And there seems to be a lot about how long it takes to even apply for asylum in France - 3-4 months before an application can be lodged.
This is a really interesting article.