They are just people doing what they need to survive in a harsh world...
They will do what they have to do and will continue to slip through..Good luck to them and I would do the same in their position.
They know the consequences they face if caught.
The British gov are tough on immigrants when it suits them and then the European union soften them up a bit by opening the flood gates for them..
Thats perfectly fine though as it is all legal and above board..