The Calais migrants are safe and they are relatively wealthy and also physically healthy to have made the long journey. The truly desperate are the ones still trapped in war torn countries. Britain is working with other nations to end the civil war in Syria and get people into safe camps, so I don't know what your issue is OP.
Letting in some of the Calais migrants will just encourage more to come over which will make the crisis worse, with more people dying in the Med sea. This just gives more power to the people traffickers.
And let's not forget the numerous homeless and hungry Brits that exist. Yet you want to bring in a bunch of economic migrants? Funny how some people love to get all self-righteous about issues in foreign nations and want to meddle, yet ignore the fact that Britain has its own problems, which really should be the top priority. The impoverished and downtrodden in Britain are the ones you are in best position to support, yet will continue to be forgotten. Why? Probably because it's easier to advocate about something trendy and pat yourself on the back, than get your hands dirty trying to fix problems like homelessness, poverty and crime in your county.